645626272 has 24 divisors (see below), whose sum is σ = 1345847076. Its totient is φ = 303823872.

The previous prime is 645626269. The next prime is 645626281. The reversal of 645626272 is 272626546.

It can be written as a sum of positive squares in 2 ways, for example, as 532501776 + 113124496 = 23076^2 + 10636^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 592863 + ... + 593950.

Almost surely, 2^645626272 is an apocalyptic number.

It is an amenable number.

645626272 is an abundant number, since it is smaller than the sum of its proper divisors (700220804).

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

645626272 is a wasteful number, since it uses less digits than its factorization.

645626272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1186840 (or 1186832 counting only the distinct ones).

The product of its digits is 241920, while the sum is 40.

The square root of 645626272 is about 25409.1769248829. The cubic root of 645626272 is about 864.2918110108.

The spelling of 645626272 in words is "six hundred forty-five million, six hundred twenty-six thousand, two hundred seventy-two".