86490639 has 16 divisors (see below), whose sum is σ = 128505600. Its totient is φ = 57493368.

The previous prime is 86490629. The next prime is 86490653. The reversal of 86490639 is 93609468.

86490639 is a `hidden beast` number, since 8 + 6 + 4 + 9 + 0 + 639 = 666.

It is not a de Polignac number, because 86490639 - 2⁴ = 86490623 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 86490594 and 86490603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86490629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5232 + ... + 14154.

It is an arithmetic number, because the mean of its divisors is an integer number (8031600).

Almost surely, 2^86490639 is an apocalyptic number.

86490639 is a deficient number, since it is larger than the sum of its proper divisors (42014961).

86490639 is a wasteful number, since it uses less digits than its factorization.

86490639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9291 (or 9285 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The square root of 86490639 is about 9300.0343547753. The cubic root of 86490639 is about 442.2383169815.

The spelling of 86490639 in words is "eighty-six million, four hundred ninety thousand, six hundred thirty-nine".