86831280 has 120 divisors (see below), whose sum is σ = 295324848. Its totient is φ = 22860288.

The previous prime is 86831219. The next prime is 86831281. The reversal of 86831280 is 8213868.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (86831281) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 59034 + ... + 60486.

Almost surely, 2^86831280 is an apocalyptic number.

86831280 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 86831280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (147662424).

86831280 is an abundant number, since it is smaller than the sum of its proper divisors (208493568).

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

86831280 is a wasteful number, since it uses less digits than its factorization.

86831280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1555 (or 1546 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 86831280 is about 9318.3303225417. The cubic root of 86831280 is about 442.8181375884.

The spelling of 86831280 in words is "eighty-six million, eight hundred thirty-one thousand, two hundred eighty".