646495488 has 54 divisors (see below), whose sum is σ = 1864012514. Its totient is φ = 215497728.

The previous prime is 646495469. The next prime is 646495489. The reversal of 646495488 is 884594646.

It can be written as a sum of positive squares in only one way, i.e., 620607744 + 25887744 = 24912^2 + 5088^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646495489) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 137995 + ... + 142602.

Almost surely, 2^646495488 is an apocalyptic number.

It is an amenable number.

646495488 is an abundant number, since it is smaller than the sum of its proper divisors (1217517026).

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

646495488 is a wasteful number, since it uses less digits than its factorization.

646495488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280619 (or 280602 counting only the distinct ones).

The product of its digits is 6635520, while the sum is 54.

The square root of 646495488 is about 25426.2755432250. The cubic root of 646495488 is about 864.6795066033.

The spelling of 646495488 in words is "six hundred forty-six million, four hundred ninety-five thousand, four hundred eighty-eight".