868617720 has 96 divisors (see below), whose sum is σ = 2989087920. Its totient is φ = 218004480.

The previous prime is 868617707. The next prime is 868617749. The reversal of 868617720 is 27716868.

868617720 is a `hidden beast` number, since 8 + 6 + 8 + 617 + 7 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 64846 + ... + 77085.

Almost surely, 2^868617720 is an apocalyptic number.

It is an amenable number.

868617720 is an abundant number, since it is smaller than the sum of its proper divisors (2120470200).

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

868617720 is a wasteful number, since it uses less digits than its factorization.

868617720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141965 (or 141958 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The square root of 868617720 is about 29472.3212523208. The cubic root of 868617720 is about 954.1344166705.

The spelling of 868617720 in words is "eight hundred sixty-eight million, six hundred seventeen thousand, seven hundred twenty".