86639628 has 18 divisors (see below), whose sum is σ = 202234396. Its totient is φ = 28869128.

The previous prime is 86639603. The next prime is 86639629. The reversal of 86639628 is 82693668.

It is not an unprimeable number, because it can be changed into a prime (86639629) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 30901 + ... + 33587.

Almost surely, 2^86639628 is an apocalyptic number.

It is an amenable number.

86639628 is an abundant number, since it is smaller than the sum of its proper divisors (115594768).

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

86639628 is an equidigital number, since it uses as much as digits as its factorization.

86639628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5381 (or 2692 counting only the distinct ones).

The product of its digits is 746496, while the sum is 48.

The square root of 86639628 is about 9308.0410398751. The cubic root of 86639628 is about 442.4921049375.

Multiplying 86639628 by its sum of digits (48), we get a square (4158702144 = 64488²).

The spelling of 86639628 in words is "eighty-six million, six hundred thirty-nine thousand, six hundred twenty-eight".