645012774 has 48 divisors (see below), whose sum is σ = 1667386800. Its totient is φ = 184288608.

The previous prime is 645012769. The next prime is 645012803. The reversal of 645012774 is 477210546.

645012774 is a `hidden beast` number, since 64 + 501 + 27 + 74 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 119239 + ... + 124530.

It is an arithmetic number, because the mean of its divisors is an integer number (34737225).

Almost surely, 2^645012774 is an apocalyptic number.

645012774 is an abundant number, since it is smaller than the sum of its proper divisors (1022374026).

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

645012774 is a wasteful number, since it uses less digits than its factorization.

645012774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243794 (or 243781 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 36.

The square root of 645012774 is about 25397.1016850348. The cubic root of 645012774 is about 864.0179635540.

The spelling of 645012774 in words is "six hundred forty-five million, twelve thousand, seven hundred seventy-four".