645055642 has 64 divisors (see below), whose sum is σ = 1277337600. Its totient is φ = 236940480.

The previous prime is 645055627. The next prime is 645055651. The reversal of 645055642 is 246550546.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 190359 + ... + 193717.

It is an arithmetic number, because the mean of its divisors is an integer number (19958400).

Almost surely, 2^645055642 is an apocalyptic number.

645055642 is a deficient number, since it is larger than the sum of its proper divisors (632281958).

645055642 is a wasteful number, since it uses less digits than its factorization.

645055642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3451.

The product of its (nonzero) digits is 144000, while the sum is 37.

The square root of 645055642 is about 25397.9456255816. The cubic root of 645055642 is about 864.0371042093.

The spelling of 645055642 in words is "six hundred forty-five million, fifty-five thousand, six hundred forty-two".