86921980 has 24 divisors (see below), whose sum is σ = 182739312. Its totient is φ = 34730112.

The previous prime is 86921971. The next prime is 86921983. The reversal of 86921980 is 8912968.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86921983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22039 + ... + 25681.

It is an arithmetic number, because the mean of its divisors is an integer number (7614138).

Almost surely, 2^86921980 is an apocalyptic number.

It is an amenable number.

86921980 is an abundant number, since it is smaller than the sum of its proper divisors (95817332).

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

86921980 is a wasteful number, since it uses less digits than its factorization.

86921980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4845 (or 4843 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 86921980 is about 9323.1958040148. The cubic root of 86921980 is about 442.9722664877.

The spelling of 86921980 in words is "eighty-six million, nine hundred twenty-one thousand, nine hundred eighty".