645288072 has 64 divisors (see below), whose sum is σ = 1895261760. Its totient is φ = 180499200.

The previous prime is 645288071. The next prime is 645288079. The reversal of 645288072 is 270882546.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (645288071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90579 + ... + 97442.

It is an arithmetic number, because the mean of its divisors is an integer number (29613465).

Almost surely, 2^645288072 is an apocalyptic number.

It is an amenable number.

645288072 is an abundant number, since it is smaller than the sum of its proper divisors (1249973688).

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

645288072 is a wasteful number, since it uses less digits than its factorization.

645288072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188054 (or 188050 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 42.

The square root of 645288072 is about 25402.5209772574. The cubic root of 645288072 is about 864.1408699491.

The spelling of 645288072 in words is "six hundred forty-five million, two hundred eighty-eight thousand, seventy-two".