181079990 has 128 divisors (see below), whose sum is σ = 425779200. Its totient is φ = 55036800.

The previous prime is 181079957. The next prime is 181080001. The reversal of 181079990 is 99970181.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1382225 + ... + 1382355.

It is an arithmetic number, because the mean of its divisors is an integer number (3326400).

Almost surely, 2^181079990 is an apocalyptic number.

181079990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

181079990 is an abundant number, since it is smaller than the sum of its proper divisors (244699210).

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

181079990 is a wasteful number, since it uses less digits than its factorization.

181079990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203 (or 189 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 44.

The square root of 181079990 is about 13456.5965236385. The cubic root of 181079990 is about 565.7485991608.

The spelling of 181079990 in words is "one hundred eighty-one million, seventy-nine thousand, nine hundred ninety".