841220640 has 240 divisors, whose sum is σ = 3197818008. Its totient is φ = 207028224.

The previous prime is 841220629. The next prime is 841220651. The reversal of 841220640 is 46022148.

841220640 is a `hidden beast` number, since 8 + 4 + 12 + 2 + 0 + 640 = 666.

It is an interprime number because it is at equal distance from previous prime (841220629) and next prime (841220651).

It can be written as a sum of positive squares in 4 ways, for example, as 461906064 + 379314576 = 21492^2 + 19476^2 .

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 165984 + ... + 170976.

Almost surely, 2^841220640 is an apocalyptic number.

841220640 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 841220640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1598909004).

841220640 is an abundant number, since it is smaller than the sum of its proper divisors (2356597368).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

841220640 is a wasteful number, since it uses less digits than its factorization.

841220640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5033 (or 5016 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 841220640 is about 29003.8038884557. The cubic root of 841220640 is about 943.9956070848.

Adding to 841220640 its reverse (46022148), we get a palindrome (887242788).

The spelling of 841220640 in words is "eight hundred forty-one million, two hundred twenty thousand, six hundred forty".