646640496 has 70 divisors (see below), whose sum is σ = 1878473520. Its totient is φ = 215542944.

The previous prime is 646640431. The next prime is 646640503. The reversal of 646640496 is 694046646.

646640496 is a `hidden beast` number, since 64 + 66 + 40 + 496 = 666.

646640496 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 16056 + ... + 39383.

It is an arithmetic number, because the mean of its divisors is an integer number (26835336).

Almost surely, 2^646640496 is an apocalyptic number.

It is an amenable number.

646640496 is an abundant number, since it is smaller than the sum of its proper divisors (1231833024).

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

646640496 is an equidigital number, since it uses as much as digits as its factorization.

646640496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55465 (or 55444 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 45.

The square root of 646640496 is about 25429.1269217014. The cubic root of 646640496 is about 864.7441505567.

The spelling of 646640496 in words is "six hundred forty-six million, six hundred forty thousand, four hundred ninety-six".