80981956 has 24 divisors (see below), whose sum is σ = 155725920. Its totient is φ = 36542400.

The previous prime is 80981939. The next prime is 80981959. The reversal of 80981956 is 65918908.

It is not an unprimeable number, because it can be changed into a prime (80981959) 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, 505 + ... + 12736.

It is an arithmetic number, because the mean of its divisors is an integer number (6488580).

Almost surely, 2^80981956 is an apocalyptic number.

It is an amenable number.

80981956 is a deficient number, since it is larger than the sum of its proper divisors (74743964).

80981956 is a wasteful number, since it uses less digits than its factorization.

80981956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13395 (or 13393 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 46.

The square root of 80981956 is about 8998.9974997218. The cubic root of 80981956 is about 432.6427403714.

The spelling of 80981956 in words is "eighty million, nine hundred eighty-one thousand, nine hundred fifty-six".