86806490 has 16 divisors (see below), whose sum is σ = 158393448. Its totient is φ = 34246656.

The previous prime is 86806469. The next prime is 86806493. The reversal of 86806490 is 9460868.

It is a Cunningham number, because it is equal to 9317²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 49266361 + 37540129 = 7019^2 + 6127^2 .

It is a super-2 number, since 2×86806490² = 15070733412240200, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (86806493) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58727 + ... + 60186.

Almost surely, 2^86806490 is an apocalyptic number.

86806490 is a deficient number, since it is larger than the sum of its proper divisors (71586958).

86806490 is a wasteful number, since it uses less digits than its factorization.

86806490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118993.

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 86806490 is about 9317.0000536653. Note that the first 4 decimals coincide. The cubic root of 86806490 is about 442.7759926130.

The spelling of 86806490 in words is "eighty-six million, eight hundred six thousand, four hundred ninety".