80979700 has 18 divisors (see below), whose sum is σ = 175726166. Its totient is φ = 32391840.

The previous prime is 80979649. The next prime is 80979709. The reversal of 80979700 is 797908.

It can be written as a sum of positive squares in 3 ways, for example, as 2196324 + 78783376 = 1482^2 + 8876^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80979709) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 404799 + ... + 404998.

Almost surely, 2^80979700 is an apocalyptic number.

It is an amenable number.

80979700 is an abundant number, since it is smaller than the sum of its proper divisors (94746466).

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

80979700 is a wasteful number, since it uses less digits than its factorization.

80979700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809811 (or 809804 counting only the distinct ones).

The product of its (nonzero) digits is 31752, while the sum is 40.

The square root of 80979700 is about 8998.8721515532. The cubic root of 80979700 is about 432.6387228053.

The spelling of 80979700 in words is "eighty million, nine hundred seventy-nine thousand, seven hundred".