86640732 has 48 divisors (see below), whose sum is σ = 227808000. Its totient is φ = 28470960.

The previous prime is 86640713. The next prime is 86640767. The reversal of 86640732 is 23704668.

86640732 is a `hidden beast` number, since 8 + 6 + 640 + 7 + 3 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

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, 2019 + ... + 13317.

It is an arithmetic number, because the mean of its divisors is an integer number (4746000).

Almost surely, 2^86640732 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 86640732, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113904000).

86640732 is an abundant number, since it is smaller than the sum of its proper divisors (141167268).

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

86640732 is a wasteful number, since it uses less digits than its factorization.

86640732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11383 (or 11375 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 86640732 is about 9308.1003432494. The cubic root of 86640732 is about 442.4939844054.

The spelling of 86640732 in words is "eighty-six million, six hundred forty thousand, seven hundred thirty-two".