86431864 has 8 divisors (see below), whose sum is σ = 162059760. Its totient is φ = 43215928.

The previous prime is 86431853. The next prime is 86431871. The reversal of 86431864 is 46813468.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×86431864² = 14940934229028992, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5401984 + ... + 5401999.

It is an arithmetic number, because the mean of its divisors is an integer number (20257470).

Almost surely, 2^86431864 is an apocalyptic number.

It is an amenable number.

86431864 is a deficient number, since it is larger than the sum of its proper divisors (75627896).

86431864 is a wasteful number, since it uses less digits than its factorization.

86431864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10803989 (or 10803985 counting only the distinct ones).

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

The square root of 86431864 is about 9296.8738831932. The cubic root of 86431864 is about 442.1381194442.

The spelling of 86431864 in words is "eighty-six million, four hundred thirty-one thousand, eight hundred sixty-four".