646997032 has 48 divisors (see below), whose sum is σ = 1368904320. Its totient is φ = 284018400.

The previous prime is 646997027. The next prime is 646997069. The reversal of 646997032 is 230799646.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1328293 + ... + 1328779.

It is an arithmetic number, because the mean of its divisors is an integer number (28518840).

Almost surely, 2^646997032 is an apocalyptic number.

646997032 is a gapful number since it is divisible by the number (62) 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 646997032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (684452160).

646997032 is an abundant number, since it is smaller than the sum of its proper divisors (721907288).

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

646997032 is a wasteful number, since it uses less digits than its factorization.

646997032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1022 (or 531 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 46.

The square root of 646997032 is about 25436.1363418268. The cubic root of 646997032 is about 864.9030517160.

The spelling of 646997032 in words is "six hundred forty-six million, nine hundred ninety-seven thousand, thirty-two".