877661644 has 12 divisors (see below), whose sum is σ = 1568587104. Its totient is φ = 429493904.

The previous prime is 877661633. The next prime is 877661657. The reversal of 877661644 is 446166778.

It is a super-2 number, since 2×877661644² = 1540579922697565472, which contains 22 as substring.

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, 2334019 + ... + 2334394.

It is an arithmetic number, because the mean of its divisors is an integer number (130715592).

Almost surely, 2^877661644 is an apocalyptic number.

It is an amenable number.

877661644 is a deficient number, since it is larger than the sum of its proper divisors (690925460).

877661644 is a wasteful number, since it uses less digits than its factorization.

877661644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4668464 (or 4668462 counting only the distinct ones).

The product of its digits is 1354752, while the sum is 49.

The square root of 877661644 is about 29625.3547489309. The cubic root of 877661644 is about 957.4344271755.

The spelling of 877661644 in words is "eight hundred seventy-seven million, six hundred sixty-one thousand, six hundred forty-four".