977721634 has 16 divisors (see below), whose sum is σ = 1498217472. Its totient is φ = 478364848.

The previous prime is 977721611. The next prime is 977721649. The reversal of 977721634 is 436127779.

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, 28557 + ... + 52639.

It is an arithmetic number, because the mean of its divisors is an integer number (93638592).

Almost surely, 2^977721634 is an apocalyptic number.

977721634 is a deficient number, since it is larger than the sum of its proper divisors (520495838).

977721634 is a wasteful number, since it uses less digits than its factorization.

977721634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24521.

The product of its digits is 444528, while the sum is 46.

The square root of 977721634 is about 31268.5406439124. The cubic root of 977721634 is about 992.5180378553.

The spelling of 977721634 in words is "nine hundred seventy-seven million, seven hundred twenty-one thousand, six hundred thirty-four".