86640628 has 12 divisors (see below), whose sum is σ = 153123012. Its totient is φ = 42891200.

The previous prime is 86640623. The next prime is 86640641. The reversal of 86640628 is 82604668.

It can be written as a sum of positive squares in 2 ways, for example, as 83393424 + 3247204 = 9132^2 + 1802^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86640623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106825 + ... + 107632.

It is an arithmetic number, because the mean of its divisors is an integer number (12760251).

Almost surely, 2^86640628 is an apocalyptic number.

It is an amenable number.

86640628 is a deficient number, since it is larger than the sum of its proper divisors (66482384).

86640628 is a wasteful number, since it uses less digits than its factorization.

86640628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214562 (or 214560 counting only the distinct ones).

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

The square root of 86640628 is about 9308.0947567158. The cubic root of 86640628 is about 442.4938073548.

The spelling of 86640628 in words is "eighty-six million, six hundred forty thousand, six hundred twenty-eight".