80815860 has 96 divisors (see below), whose sum is σ = 254042880. Its totient is φ = 21326976.

The previous prime is 80815829. The next prime is 80815883. The reversal of 80815860 is 6851808.

It is a Harshad number since it is a multiple of its sum of digits (36).

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 31 ways as a sum of consecutive naturals, for example, 54894 + ... + 56346.

It is an arithmetic number, because the mean of its divisors is an integer number (2646280).

Almost surely, 2^80815860 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 80815860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (127021440).

80815860 is an abundant number, since it is smaller than the sum of its proper divisors (173227020).

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

80815860 is a wasteful number, since it uses less digits than its factorization.

80815860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1574 (or 1566 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 36.

The square root of 80815860 is about 8989.7641793320. The cubic root of 80815860 is about 432.3467509220.

The spelling of 80815860 in words is "eighty million, eight hundred fifteen thousand, eight hundred sixty".