86891280 has 80 divisors (see below), whose sum is σ = 307849344. Its totient is φ = 19860480.

The previous prime is 86891257. The next prime is 86891293. The reversal of 86891280 is 8219868.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (42).

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 in 15 ways as a sum of consecutive naturals, for example, 24181 + ... + 27540.

Almost surely, 2^86891280 is an apocalyptic number.

86891280 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

86891280 is an abundant number, since it is smaller than the sum of its proper divisors (220958064).

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

86891280 is a wasteful number, since it uses less digits than its factorization.

86891280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51744 (or 51738 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 42.

The square root of 86891280 is about 9321.5492274621. The cubic root of 86891280 is about 442.9201091778.

The spelling of 86891280 in words is "eighty-six million, eight hundred ninety-one thousand, two hundred eighty".