865942880 has 48 divisors (see below), whose sum is σ = 2231775504. Its totient is φ = 314887680.

The previous prime is 865942811. The next prime is 865942897. The reversal of 865942880 is 88249568.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 244247 + ... + 247766.

It is an arithmetic number, because the mean of its divisors is an integer number (46495323).

Almost surely, 2^865942880 is an apocalyptic number.

865942880 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

865942880 is an abundant number, since it is smaller than the sum of its proper divisors (1365832624).

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

865942880 is a wasteful number, since it uses less digits than its factorization.

865942880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492039 (or 492031 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 50.

The square root of 865942880 is about 29426.9074148134. The cubic root of 865942880 is about 953.1540156427.

The spelling of 865942880 in words is "eight hundred sixty-five million, nine hundred forty-two thousand, eight hundred eighty".