646260040 has 64 divisors (see below), whose sum is σ = 1515024000. Its totient is φ = 247887360.

The previous prime is 646260037. The next prime is 646260071. The reversal of 646260040 is 40062646.

It is a junction number, because it is equal to n+sod(n) for n = 646259990 and 646260008.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93421 + ... + 100099.

It is an arithmetic number, because the mean of its divisors is an integer number (23672250).

Almost surely, 2^646260040 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646260040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (757512000).

646260040 is an abundant number, since it is smaller than the sum of its proper divisors (868763960).

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

646260040 is a wasteful number, since it uses less digits than its factorization.

646260040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6790 (or 6786 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 646260040 is about 25421.6451080570. The cubic root of 646260040 is about 864.5745242876.

The spelling of 646260040 in words is "six hundred forty-six million, two hundred sixty thousand, forty".