86991664 has 10 divisors (see below), whose sum is σ = 168546380. Its totient is φ = 43495824.

The previous prime is 86991649. The next prime is 86991679. The reversal of 86991664 is 46619968.

It is an interprime number because it is at equal distance from previous prime (86991649) and next prime (86991679).

It is a super-4 number, since 4×86991664⁴ (a number of 33 digits) contains 4444 as substring.

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, 2718474 + ... + 2718505.

It is an arithmetic number, because the mean of its divisors is an integer number (16854638).

Almost surely, 2^86991664 is an apocalyptic number.

It is an amenable number.

86991664 is a deficient number, since it is larger than the sum of its proper divisors (81554716).

86991664 is a wasteful number, since it uses less digits than its factorization.

86991664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5436987 (or 5436981 counting only the distinct ones).

The product of its digits is 559872, while the sum is 49.

The square root of 86991664 is about 9326.9321858798. The cubic root of 86991664 is about 443.0906095285.

The spelling of 86991664 in words is "eighty-six million, nine hundred ninety-one thousand, six hundred sixty-four".