86992639 has 4 divisors (see below), whose sum is σ = 87434424. Its totient is φ = 86550856.

The previous prime is 86992597. The next prime is 86992643. The reversal of 86992639 is 93629968.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 86992639 - 2²¹ = 84895487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86993639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220597 + ... + 220990.

It is an arithmetic number, because the mean of its divisors is an integer number (21858606).

Almost surely, 2^86992639 is an apocalyptic number.

86992639 is a deficient number, since it is larger than the sum of its proper divisors (441785).

86992639 is a wasteful number, since it uses less digits than its factorization.

86992639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441784.

The product of its digits is 1259712, while the sum is 52.

The square root of 86992639 is about 9326.9844537235. The cubic root of 86992639 is about 443.0922649044.

The spelling of 86992639 in words is "eighty-six million, nine hundred ninety-two thousand, six hundred thirty-nine".