80820680 has 96 divisors (see below), whose sum is σ = 199567800. Its totient is φ = 29417472.

The previous prime is 80820679. The next prime is 80820697. The reversal of 80820680 is 8602808.

It can be written as a sum of positive squares in 4 ways, for example, as 56040196 + 24780484 = 7486^2 + 4978^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 418664 + ... + 418856.

Almost surely, 2^80820680 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 80820680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99783900).

80820680 is an abundant number, since it is smaller than the sum of its proper divisors (118747120).

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

80820680 is a wasteful number, since it uses less digits than its factorization.

80820680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271 (or 248 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 80820680 is about 8990.0322580066. The cubic root of 80820680 is about 432.3553460579.

The spelling of 80820680 in words is "eighty million, eight hundred twenty thousand, six hundred eighty".