644060676 has 48 divisors (see below), whose sum is σ = 1732719744. Its totient is φ = 182386176.

The previous prime is 644060663. The next prime is 644060699. The reversal of 644060676 is 676060446.

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, 24435 + ... + 43418.

It is an arithmetic number, because the mean of its divisors is an integer number (36098328).

Almost surely, 2^644060676 is an apocalyptic number.

It is an amenable number.

644060676 is an abundant number, since it is smaller than the sum of its proper divisors (1088659068).

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

644060676 is a wasteful number, since it uses less digits than its factorization.

644060676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67980 (or 67978 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 39.

The square root of 644060676 is about 25378.3505374167. The cubic root of 644060676 is about 863.5926309614.

The spelling of 644060676 in words is "six hundred forty-four million, sixty thousand, six hundred seventy-six".