877431978 has 24 divisors (see below), whose sum is σ = 1902593316. Its totient is φ = 292248000.

The previous prime is 877431977. The next prime is 877432007. The reversal of 877431978 is 879134778.

It can be written as a sum of positive squares in 2 ways, for example, as 873379809 + 4052169 = 29553^2 + 2013^2 .

It is not an unprimeable number, because it can be changed into a prime (877431977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5328 + ... + 42228.

Almost surely, 2^877431978 is an apocalyptic number.

877431978 is an abundant number, since it is smaller than the sum of its proper divisors (1025161338).

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

877431978 is a wasteful number, since it uses less digits than its factorization.

877431978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38230 (or 38227 counting only the distinct ones).

The product of its digits is 2370816, while the sum is 54.

The square root of 877431978 is about 29621.4783223255. The cubic root of 877431978 is about 957.3509062577.

The spelling of 877431978 in words is "eight hundred seventy-seven million, four hundred thirty-one thousand, nine hundred seventy-eight".