86660720 has 40 divisors (see below), whose sum is σ = 202982544. Its totient is φ = 34406912.

The previous prime is 86660701. The next prime is 86660731. The reversal of 86660720 is 2706668.

It is a tau number, because it is divible by the number of its divisors (40).

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, 7007 + ... + 14913.

Almost surely, 2^86660720 is an apocalyptic number.

86660720 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 86660720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101491272).

86660720 is an abundant number, since it is smaller than the sum of its proper divisors (116321824).

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

86660720 is a wasteful number, since it uses less digits than its factorization.

86660720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8057 (or 8051 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 86660720 is about 9309.1739697999. The cubic root of 86660720 is about 442.5280095477.

The spelling of 86660720 in words is "eighty-six million, six hundred sixty thousand, seven hundred twenty".