646497580 has 24 divisors (see below), whose sum is σ = 1404461520. Its totient is φ = 249681600.

The previous prime is 646497569. The next prime is 646497619. The reversal of 646497580 is 85794646.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 556746 + ... + 557905.

It is an arithmetic number, because the mean of its divisors is an integer number (58519230).

Almost surely, 2^646497580 is an apocalyptic number.

It is an amenable number.

646497580 is an abundant number, since it is smaller than the sum of its proper divisors (757963940).

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

646497580 is a wasteful number, since it uses less digits than its factorization.

646497580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1114689 (or 1114687 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 49.

The square root of 646497580 is about 25426.3166817374. The cubic root of 646497580 is about 864.6804392768.

The spelling of 646497580 in words is "six hundred forty-six million, four hundred ninety-seven thousand, five hundred eighty".