865977960 has 128 divisors (see below), whose sum is σ = 2796249600. Its totient is φ = 213749760.

The previous prime is 865977947. The next prime is 865977979. The reversal of 865977960 is 69779568.

865977960 = T₃₇₈ + T₃₇₉ + ... + T₁₇₃₇.

It is a self number, because there is not a number n which added to its sum of digits gives 865977960.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 120961 + ... + 127919.

It is an arithmetic number, because the mean of its divisors is an integer number (21845700).

Almost surely, 2^865977960 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 865977960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1398124800).

865977960 is an abundant number, since it is smaller than the sum of its proper divisors (1930271640).

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

865977960 is a wasteful number, since it uses less digits than its factorization.

865977960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7051 (or 7047 counting only the distinct ones).

The product of its (nonzero) digits is 5715360, while the sum is 57.

The square root of 865977960 is about 29427.5034618977. The cubic root of 865977960 is about 953.1668864652.

The spelling of 865977960 in words is "eight hundred sixty-five million, nine hundred seventy-seven thousand, nine hundred sixty".