644501074 has 16 divisors (see below), whose sum is σ = 1105200000. Its totient is φ = 276129504.

The previous prime is 644501047. The next prime is 644501107. The reversal of 644501074 is 470105446.

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, 65382 + ... + 74590.

It is an arithmetic number, because the mean of its divisors is an integer number (69075000).

Almost surely, 2^644501074 is an apocalyptic number.

644501074 is a deficient number, since it is larger than the sum of its proper divisors (460698926).

644501074 is a wasteful number, since it uses less digits than its factorization.

644501074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14217.

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 644501074 is about 25387.0257021180. The cubic root of 644501074 is about 863.7894228828.

The spelling of 644501074 in words is "six hundred forty-four million, five hundred one thousand, seventy-four".