86991020 has 24 divisors (see below), whose sum is σ = 186130224. Its totient is φ = 34139456.

The previous prime is 86991017. The next prime is 86991029. The reversal of 86991020 is 2019968.

It is a super-4 number, since 4×86991020⁴ (a number of 33 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (86991029) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 39974 + ... + 42093.

It is an arithmetic number, because the mean of its divisors is an integer number (7755426).

Almost surely, 2^86991020 is an apocalyptic number.

It is an amenable number.

86991020 is an abundant number, since it is smaller than the sum of its proper divisors (99139204).

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

86991020 is a wasteful number, since it uses less digits than its factorization.

86991020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82129 (or 82127 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 86991020 is about 9326.8976621383. The cubic root of 86991020 is about 443.0895161246.

The spelling of 86991020 in words is "eighty-six million, nine hundred ninety-one thousand, twenty".