645276732 has 24 divisors (see below), whose sum is σ = 1528119936. Its totient is φ = 211881648.

The previous prime is 645276721. The next prime is 645276743. The reversal of 645276732 is 237672546.

It is an interprime number because it is at equal distance from previous prime (645276721) and next prime (645276743).

It is a congruent number.

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, 400488 + ... + 402095.

It is an arithmetic number, because the mean of its divisors is an integer number (63671664).

Almost surely, 2^645276732 is an apocalyptic number.

It is an amenable number.

645276732 is an abundant number, since it is smaller than the sum of its proper divisors (882843204).

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

645276732 is a wasteful number, since it uses less digits than its factorization.

645276732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 802657 (or 802655 counting only the distinct ones).

The product of its digits is 423360, while the sum is 42.

The square root of 645276732 is about 25402.2977700837. The cubic root of 645276732 is about 864.1358079129.

The spelling of 645276732 in words is "six hundred forty-five million, two hundred seventy-six thousand, seven hundred thirty-two".