86640826 has 4 divisors (see below), whose sum is σ = 129961242. Its totient is φ = 43320412.

The previous prime is 86640781. The next prime is 86640859. The reversal of 86640826 is 62804668.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 54774801 + 31866025 = 7401^2 + 5645^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21660205 + ... + 21660208.

Almost surely, 2^86640826 is an apocalyptic number.

86640826 is a deficient number, since it is larger than the sum of its proper divisors (43320416).

86640826 is a wasteful number, since it uses less digits than its factorization.

86640826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43320415.

The product of its (nonzero) digits is 110592, while the sum is 40.

The square root of 86640826 is about 9308.1053926135. The cubic root of 86640826 is about 442.4941444319.

The spelling of 86640826 in words is "eighty-six million, six hundred forty thousand, eight hundred twenty-six".