645236272 has 20 divisors (see below), whose sum is σ = 1271336040. Its totient is φ = 317149568.

The previous prime is 645236239. The next prime is 645236287. The reversal of 645236272 is 272632546.

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, 340813 + ... + 342700.

It is an arithmetic number, because the mean of its divisors is an integer number (63566802).

Almost surely, 2^645236272 is an apocalyptic number.

It is an amenable number.

645236272 is a deficient number, since it is larger than the sum of its proper divisors (626099768).

645236272 is a wasteful number, since it uses less digits than its factorization.

645236272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 683580 (or 683574 counting only the distinct ones).

The product of its digits is 120960, while the sum is 37.

The square root of 645236272 is about 25401.5013729504. The cubic root of 645236272 is about 864.1177465841.

It can be divided in two parts, 6452 and 36272, that added together give a palindrome (42724).

The spelling of 645236272 in words is "six hundred forty-five million, two hundred thirty-six thousand, two hundred seventy-two".