877864640 has 56 divisors (see below), whose sum is σ = 2106972672. Its totient is φ = 348364800.

The previous prime is 877864609. The next prime is 877864643. The reversal of 877864640 is 46468778.

It is not an unprimeable number, because it can be changed into a prime (877864643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29840 + ... + 51440.

It is an arithmetic number, because the mean of its divisors is an integer number (37624512).

Almost surely, 2^877864640 is an apocalyptic number.

877864640 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 877864640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1053486336).

877864640 is an abundant number, since it is smaller than the sum of its proper divisors (1229108032).

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

877864640 is a wasteful number, since it uses less digits than its factorization.

877864640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21745 (or 21735 counting only the distinct ones).

The product of its (nonzero) digits is 1806336, while the sum is 50.

The square root of 877864640 is about 29628.7806026505. The cubic root of 877864640 is about 957.5082370839.

The spelling of 877864640 in words is "eight hundred seventy-seven million, eight hundred sixty-four thousand, six hundred forty".