86680840 has 16 divisors (see below), whose sum is σ = 195031980. Its totient is φ = 34672320.

The previous prime is 86680837. The next prime is 86680843. The reversal of 86680840 is 4808668.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (86680837) and next prime (86680843).

It can be written as a sum of positive squares in 2 ways, for example, as 71267364 + 15413476 = 8442^2 + 3926^2 .

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 2167021 = 86680840 / (8 + 6 + 6 + 8 + 0 + 8 + 4 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 86680793 and 86680802.

It is not an unprimeable number, because it can be changed into a prime (86680843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1083471 + ... + 1083550.

Almost surely, 2^86680840 is an apocalyptic number.

It is an amenable number.

86680840 is an abundant number, since it is smaller than the sum of its proper divisors (108351140).

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

86680840 is a wasteful number, since it uses less digits than its factorization.

86680840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2167032 (or 2167028 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 40.

The square root of 86680840 is about 9310.2545615037. The cubic root of 86680840 is about 442.5622541074.

The spelling of 86680840 in words is "eighty-six million, six hundred eighty thousand, eight hundred forty".