86631440 has 40 divisors (see below), whose sum is σ = 230193600. Its totient is φ = 29702016.

The previous prime is 86631427. The next prime is 86631463. The reversal of 86631440 is 4413668.

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

It is a junction number, because it is equal to n+sod(n) for n = 86631397 and 86631406.

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, 76790 + ... + 77909.

It is an arithmetic number, because the mean of its divisors is an integer number (5754840).

Almost surely, 2^86631440 is an apocalyptic number.

86631440 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

86631440 is an abundant number, since it is smaller than the sum of its proper divisors (143562160).

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

86631440 is a wasteful number, since it uses less digits than its factorization.

86631440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154719 (or 154713 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 86631440 is about 9307.6011947225. The cubic root of 86631440 is about 442.4781650519.

The spelling of 86631440 in words is "eighty-six million, six hundred thirty-one thousand, four hundred forty".