877640977 has 4 divisors (see below), whose sum is σ = 892028596. Its totient is φ = 863253360.

The previous prime is 877640971. The next prime is 877640987. The reversal of 877640977 is 779046778.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 489117456 + 388523521 = 22116^2 + 19711^2 .

It is a cyclic number.

It is not a de Polignac number, because 877640977 - 2¹⁹ = 877116689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (877640971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7193718 + ... + 7193839.

It is an arithmetic number, because the mean of its divisors is an integer number (223007149).

Almost surely, 2^877640977 is an apocalyptic number.

It is an amenable number.

877640977 is a deficient number, since it is larger than the sum of its proper divisors (14387619).

877640977 is a wasteful number, since it uses less digits than its factorization.

877640977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14387618.

The product of its (nonzero) digits is 4148928, while the sum is 55.

The square root of 877640977 is about 29625.0059409277. The cubic root of 877640977 is about 957.4269119587.

The spelling of 877640977 in words is "eight hundred seventy-seven million, six hundred forty thousand, nine hundred seventy-seven".