645577674 has 32 divisors (see below), whose sum is σ = 1477556736. Its totient is φ = 184206960.

The previous prime is 645577663. The next prime is 645577711. The reversal of 645577674 is 476775546.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23289 + ... + 42819.

It is an arithmetic number, because the mean of its divisors is an integer number (46173648).

Almost surely, 2^645577674 is an apocalyptic number.

645577674 is an abundant number, since it is smaller than the sum of its proper divisors (831979062).

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

645577674 is a wasteful number, since it uses less digits than its factorization.

645577674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20330.

The product of its digits is 4939200, while the sum is 51.

The square root of 645577674 is about 25408.2205988534. The cubic root of 645577674 is about 864.2701246218.

The spelling of 645577674 in words is "six hundred forty-five million, five hundred seventy-seven thousand, six hundred seventy-four".