80991360 has 256 divisors, whose sum is σ = 296208000. Its totient is φ = 20901888.

The previous prime is 80991341. The next prime is 80991371. The reversal of 80991360 is 6319908.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 742986 + ... + 743094.

Almost surely, 2^80991360 is an apocalyptic number.

80991360 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 80991360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (148104000).

80991360 is an abundant number, since it is smaller than the sum of its proper divisors (215216640).

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

80991360 is a wasteful number, since it uses less digits than its factorization.

80991360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180 (or 162 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 80991360 is about 8999.5199871993. The cubic root of 80991360 is about 432.6594865498.

The spelling of 80991360 in words is "eighty million, nine hundred ninety-one thousand, three hundred sixty".