645269632 has 48 divisors (see below), whose sum is σ = 1495389870. Its totient is φ = 276541440.

The previous prime is 645269609. The next prime is 645269671. The reversal of 645269632 is 236962546.

It can be written as a sum of positive squares in only one way, i.e., 431642176 + 213627456 = 20776^2 + 14616^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 45169 + ... + 57712.

Almost surely, 2^645269632 is an apocalyptic number.

It is an amenable number.

645269632 is an abundant number, since it is smaller than the sum of its proper divisors (850120238).

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

645269632 is a wasteful number, since it uses less digits than its factorization.

645269632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102909 (or 102890 counting only the distinct ones).

The product of its digits is 466560, while the sum is 43.

The square root of 645269632 is about 25402.1580185621. The cubic root of 645269632 is about 864.1326385302.

The spelling of 645269632 in words is "six hundred forty-five million, two hundred sixty-nine thousand, six hundred thirty-two".