645192474 has 16 divisors (see below), whose sum is σ = 1291406112. Its totient is φ = 214893968.

The previous prime is 645192451. The next prime is 645192503. The reversal of 645192474 is 474291546.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34209 + ... + 49604.

It is an arithmetic number, because the mean of its divisors is an integer number (80712882).

Almost surely, 2^645192474 is an apocalyptic number.

645192474 is an abundant number, since it is smaller than the sum of its proper divisors (646213638).

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

645192474 is a wasteful number, since it uses less digits than its factorization.

645192474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85101.

The product of its digits is 241920, while the sum is 42.

The square root of 645192474 is about 25400.6392439246. The cubic root of 645192474 is about 864.0981943224.

The spelling of 645192474 in words is "six hundred forty-five million, one hundred ninety-two thousand, four hundred seventy-four".