80990136 has 96 divisors (see below), whose sum is σ = 226162560. Its totient is φ = 26174016.

The previous prime is 80990131. The next prime is 80990137. The reversal of 80990136 is 63109908.

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

It is a self number, because there is not a number n which added to its sum of digits gives 80990136.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80990131) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 496791 + ... + 496953.

It is an arithmetic number, because the mean of its divisors is an integer number (2355860).

Almost surely, 2^80990136 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 80990136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113081280).

80990136 is an abundant number, since it is smaller than the sum of its proper divisors (145172424).

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

80990136 is a wasteful number, since it uses less digits than its factorization.

80990136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345 (or 338 counting only the distinct ones).

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

The square root of 80990136 is about 8999.4519833154. The cubic root of 80990136 is about 432.6573069845.

The spelling of 80990136 in words is "eighty million, nine hundred ninety thousand, one hundred thirty-six".