868762640 has 60 divisors (see below), whose sum is σ = 2040497004. Its totient is φ = 343978752.

The previous prime is 868762633. The next prime is 868762663. The reversal of 868762640 is 46267868.

It can be written as a sum of positive squares in 2 ways, for example, as 283316224 + 585446416 = 16832^2 + 24196^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3303149 + ... + 3303411.

Almost surely, 2^868762640 is an apocalyptic number.

868762640 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 868762640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1020248502).

868762640 is an abundant number, since it is smaller than the sum of its proper divisors (1171734364).

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

868762640 is a wasteful number, since it uses less digits than its factorization.

868762640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 696 (or 427 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 47.

The square root of 868762640 is about 29474.7797277605. The cubic root of 868762640 is about 954.1874762491.

The spelling of 868762640 in words is "eight hundred sixty-eight million, seven hundred sixty-two thousand, six hundred forty".