86715520 has 128 divisors (see below), whose sum is σ = 222963840. Its totient is φ = 32169984.

The previous prime is 86715493. The next prime is 86715547. The reversal of 86715520 is 2551768.

It is an interprime number because it is at equal distance from previous prime (86715493) and next prime (86715547).

It is a tau number, because it is divible by the number of its divisors (128).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 632892 + ... + 633028.

It is an arithmetic number, because the mean of its divisors is an integer number (1741905).

Almost surely, 2^86715520 is an apocalyptic number.

86715520 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 86715520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111481920).

86715520 is an abundant number, since it is smaller than the sum of its proper divisors (136248320).

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

86715520 is a wasteful number, since it uses less digits than its factorization.

86715520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222 (or 210 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 34.

The square root of 86715520 is about 9312.1168377550. The cubic root of 86715520 is about 442.6212675817.

The spelling of 86715520 in words is "eighty-six million, seven hundred fifteen thousand, five hundred twenty".