865763880 has 64 divisors (see below), whose sum is σ = 2733998400. Its totient is φ = 218718720.

The previous prime is 865763869. The next prime is 865763881. The reversal of 865763880 is 88367568.

It is not an unprimeable number, because it can be changed into a prime (865763881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 187581 + ... + 192140.

It is an arithmetic number, because the mean of its divisors is an integer number (42718725).

Almost surely, 2^865763880 is an apocalyptic number.

It is an amenable number.

865763880 is an abundant number, since it is smaller than the sum of its proper divisors (1868234520).

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

865763880 is a wasteful number, since it uses less digits than its factorization.

865763880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379754 (or 379750 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 51.

The square root of 865763880 is about 29423.8658235114. The cubic root of 865763880 is about 953.0883352805.

The spelling of 865763880 in words is "eight hundred sixty-five million, seven hundred sixty-three thousand, eight hundred eighty".