86561980 has 12 divisors (see below), whose sum is σ = 181780200. Its totient is φ = 34624784.

The previous prime is 86561971. The next prime is 86561999. The reversal of 86561980 is 8916568.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 2164030 + ... + 2164069.

It is an arithmetic number, because the mean of its divisors is an integer number (15148350).

Almost surely, 2^86561980 is an apocalyptic number.

It is an amenable number.

86561980 is an abundant number, since it is smaller than the sum of its proper divisors (95218220).

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

86561980 is a wasteful number, since it uses less digits than its factorization.

86561980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4328108 (or 4328106 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 43.

The square root of 86561980 is about 9303.8690876431. The cubic root of 86561980 is about 442.3598756211.

The spelling of 86561980 in words is "eighty-six million, five hundred sixty-one thousand, nine hundred eighty".