646103040 has 240 divisors, whose sum is σ = 2264855040. Its totient is φ = 155975680.

The previous prime is 646103039. The next prime is 646103047. The reversal of 646103040 is 40301646.

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 (24).

It is a self number, because there is not a number n which added to its sum of digits gives 646103040.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646103047) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 2703241 + ... + 2703479.

It is an arithmetic number, because the mean of its divisors is an integer number (9436896).

Almost surely, 2^646103040 is an apocalyptic number.

646103040 is a gapful number since it is divisible by the number (60) 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 646103040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1132427520).

646103040 is an abundant number, since it is smaller than the sum of its proper divisors (1618752000).

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

646103040 is a wasteful number, since it uses less digits than its factorization.

646103040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286 (or 260 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 646103040 is about 25418.5570007426. The cubic root of 646103040 is about 864.5045064489.

Adding to 646103040 its reverse (40301646), we get a palindrome (686404686).

The spelling of 646103040 in words is "six hundred forty-six million, one hundred three thousand, forty".