645134472 has 48 divisors (see below), whose sum is σ = 1748672640. Its totient is φ = 214868448.

The previous prime is 645134453. The next prime is 645134533. The reversal of 645134472 is 274431546.

645134472 is a `hidden beast` number, since 645 + 1 + 3 + 4 + 4 + 7 + 2 = 666.

645134472 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 108193 + ... + 113999.

It is an arithmetic number, because the mean of its divisors is an integer number (36430680).

Almost surely, 2^645134472 is an apocalyptic number.

It is an amenable number.

645134472 is an abundant number, since it is smaller than the sum of its proper divisors (1103538168).

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

645134472 is a wasteful number, since it uses less digits than its factorization.

645134472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7362 (or 7355 counting only the distinct ones).

The product of its digits is 80640, while the sum is 36.

The square root of 645134472 is about 25399.4974753439. The cubic root of 645134472 is about 864.0722997625.

The spelling of 645134472 in words is "six hundred forty-five million, one hundred thirty-four thousand, four hundred seventy-two".