644062054 has 32 divisors (see below), whose sum is σ = 1029853440. Its totient is φ = 301432032.

The previous prime is 644062033. The next prime is 644062061. The reversal of 644062054 is 450260446.

It is a congruent 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, 832812 + ... + 833584.

It is an arithmetic number, because the mean of its divisors is an integer number (32182920).

Almost surely, 2^644062054 is an apocalyptic number.

644062054 is a deficient number, since it is larger than the sum of its proper divisors (385791386).

644062054 is a wasteful number, since it uses less digits than its factorization.

644062054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1164.

The product of its (nonzero) digits is 23040, while the sum is 31.

The square root of 644062054 is about 25378.3776865268. The cubic root of 644062054 is about 863.5932468608.

The spelling of 644062054 in words is "six hundred forty-four million, sixty-two thousand, fifty-four".