86991975 has 180 divisors, whose sum is σ = 205794864. Its totient is φ = 35458560.

The previous prime is 86991913. The next prime is 86991977. The reversal of 86991975 is 57919968.

It is not a de Polignac number, because 86991975 - 2¹⁰ = 86990951 is a prime.

Its product of digits (1224720) is a multiple of the sum of its prime factors (84).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86991977) by changing a digit.

It is a polite number, since it can be written in 179 ways as a sum of consecutive naturals, for example, 4578516 + ... + 4578534.

Almost surely, 2^86991975 is an apocalyptic number.

86991975 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

86991975 is an abundant number, since it is smaller than the sum of its proper divisors (118802889).

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

86991975 is a wasteful number, since it uses less digits than its factorization.

86991975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84 (or 51 counting only the distinct ones).

The product of its digits is 1224720, while the sum is 54.

The square root of 86991975 is about 9326.9488580135. The cubic root of 86991975 is about 443.0911375523.

The spelling of 86991975 in words is "eighty-six million, nine hundred ninety-one thousand, nine hundred seventy-five".