80561976 has 64 divisors (see below), whose sum is σ = 231292800. Its totient is φ = 23126400.

The previous prime is 80561959. The next prime is 80561977. The reversal of 80561976 is 67916508.

It is a super-4 number, since 4×80561976⁴ (a number of 33 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80561977) by changing a digit.

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, 3015 + ... + 13046.

It is an arithmetic number, because the mean of its divisors is an integer number (3613950).

Almost surely, 2^80561976 is an apocalyptic number.

It is an amenable number.

80561976 is an abundant number, since it is smaller than the sum of its proper divisors (150730824).

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

80561976 is a wasteful number, since it uses less digits than its factorization.

80561976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16100 (or 16096 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 42.

The square root of 80561976 is about 8975.6323454117. The cubic root of 80561976 is about 431.8935351497.

The spelling of 80561976 in words is "eighty million, five hundred sixty-one thousand, nine hundred seventy-six".