646897000 has 32 divisors (see below), whose sum is σ = 1513741320. Its totient is φ = 258758400.

The previous prime is 646896989. The next prime is 646897001. The reversal of 646897000 is 798646.

It can be written as a sum of positive squares in 4 ways, for example, as 137311524 + 509585476 = 11718^2 + 22574^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (646897001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 322449 + ... + 324448.

Almost surely, 2^646897000 is an apocalyptic number.

It is an amenable number.

646897000 is an abundant number, since it is smaller than the sum of its proper divisors (866844320).

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

646897000 is a wasteful number, since it uses less digits than its factorization.

646897000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646918 (or 646904 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 646897000 is about 25434.1699294473. The cubic root of 646897000 is about 864.8584752924.

The spelling of 646897000 in words is "six hundred forty-six million, eight hundred ninety-seven thousand".