80865564 has 48 divisors (see below), whose sum is σ = 204092448. Its totient is φ = 24772608.

The previous prime is 80865557. The next prime is 80865607. The reversal of 80865564 is 46556808.

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 15 ways as a sum of consecutive naturals, for example, 39084 + ... + 41100.

It is an arithmetic number, because the mean of its divisors is an integer number (4251926).

Almost surely, 2^80865564 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 80865564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102046224).

80865564 is an abundant number, since it is smaller than the sum of its proper divisors (123226884).

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

80865564 is a wasteful number, since it uses less digits than its factorization.

80865564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2294 (or 2292 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 42.

The square root of 80865564 is about 8992.5282318156. The cubic root of 80865564 is about 432.4353678465.

The spelling of 80865564 in words is "eighty million, eight hundred sixty-five thousand, five hundred sixty-four".