86639478 has 16 divisors (see below), whose sum is σ = 177505776. Its totient is φ = 28175360.

The previous prime is 86639461. The next prime is 86639503. The reversal of 86639478 is 87493668.

It is a super-2 number, since 2×86639478² = 15012798296224968, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 86639478.

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, 175851 + ... + 176342.

It is an arithmetic number, because the mean of its divisors is an integer number (11094111).

Almost surely, 2^86639478 is an apocalyptic number.

86639478 is an abundant number, since it is smaller than the sum of its proper divisors (90866298).

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

86639478 is a wasteful number, since it uses less digits than its factorization.

86639478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352239.

The product of its digits is 1741824, while the sum is 51.

The square root of 86639478 is about 9308.0329823223. The cubic root of 86639478 is about 442.4918495738.

The spelling of 86639478 in words is "eighty-six million, six hundred thirty-nine thousand, four hundred seventy-eight".