80181990 has 96 divisors (see below), whose sum is σ = 240252480. Its totient is φ = 18173952.

The previous prime is 80181977. The next prime is 80182001. The reversal of 80181990 is 9918108.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 85846 + ... + 86774.

It is an arithmetic number, because the mean of its divisors is an integer number (2502630).

Almost surely, 2^80181990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 80181990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120126240).

80181990 is an abundant number, since it is smaller than the sum of its proper divisors (160070490).

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

80181990 is a wasteful number, since it uses less digits than its factorization.

80181990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1086 (or 1083 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 36.

The square root of 80181990 is about 8954.4396809627. The cubic root of 80181990 is about 431.2134285307.

The spelling of 80181990 in words is "eighty million, one hundred eighty-one thousand, nine hundred ninety".