644276476 has 12 divisors (see below), whose sum is σ = 1135714608. Its totient is φ = 319786592.

The previous prime is 644276467. The next prime is 644276513. The reversal of 644276476 is 674672446.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 587296 + ... + 588391.

It is an arithmetic number, because the mean of its divisors is an integer number (94642884).

Almost surely, 2^644276476 is an apocalyptic number.

It is an amenable number.

644276476 is a deficient number, since it is larger than the sum of its proper divisors (491438132).

644276476 is a wasteful number, since it uses less digits than its factorization.

644276476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1175828 (or 1175826 counting only the distinct ones).

The product of its digits is 1354752, while the sum is 46.

The square root of 644276476 is about 25382.6018366912. The cubic root of 644276476 is about 863.6890724335.

The spelling of 644276476 in words is "six hundred forty-four million, two hundred seventy-six thousand, four hundred seventy-six".