646140632 has 16 divisors (see below), whose sum is σ = 1223510400. Its totient is φ = 319871200.

The previous prime is 646140617. The next prime is 646140643. The reversal of 646140632 is 236041646.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 399032 + ... + 400647.

It is an arithmetic number, because the mean of its divisors is an integer number (76469400).

Almost surely, 2^646140632 is an apocalyptic number.

It is an amenable number.

646140632 is a deficient number, since it is larger than the sum of its proper divisors (577369768).

646140632 is a wasteful number, since it uses less digits than its factorization.

646140632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 799786 (or 799782 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 646140632 is about 25419.2964497446. The cubic root of 646140632 is about 864.5212725172.

The spelling of 646140632 in words is "six hundred forty-six million, one hundred forty thousand, six hundred thirty-two".