86631720 has 128 divisors (see below), whose sum is σ = 299427840. Its totient is φ = 19641600.

The previous prime is 86631703. The next prime is 86631739. The reversal of 86631720 is 2713668.

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, 126499 + ... + 127181.

It is an arithmetic number, because the mean of its divisors is an integer number (2339280).

Almost surely, 2^86631720 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 86631720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (149713920).

86631720 is an abundant number, since it is smaller than the sum of its proper divisors (212796120).

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

86631720 is a wasteful number, since it uses less digits than its factorization.

86631720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 855 (or 851 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 86631720 is about 9307.6162361799. The cubic root of 86631720 is about 442.4786417601.

The spelling of 86631720 in words is "eighty-six million, six hundred thirty-one thousand, seven hundred twenty".