4391612640 has 336 divisors, whose sum is σ = 16241910048. Its totient is φ = 1119495168.

The previous prime is 4391612639. The next prime is 4391612657. The reversal of 4391612640 is 462161934.

4391612640 is a `hidden beast` number, since 4 + 3 + 9 + 1 + 6 + 1 + 2 + 640 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 4391612595 and 4391612604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 2681902 + ... + 2683538.

It is an arithmetic number, because the mean of its divisors is an integer number (48339018).

Almost surely, 2^4391612640 is an apocalyptic number.

4391612640 is a gapful number since it is divisible by the number (40) 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 4391612640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8120955024).

4391612640 is an abundant number, since it is smaller than the sum of its proper divisors (11850297408).

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

4391612640 is a wasteful number, since it uses less digits than its factorization.

4391612640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1693 (or 1670 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 4391612640 is about 66269.2435447999. The cubic root of 4391612640 is about 1637.6006755110.

The spelling of 4391612640 in words is "four billion, three hundred ninety-one million, six hundred twelve thousand, six hundred forty".