180961780 has 24 divisors (see below), whose sum is σ = 381660552. Its totient is φ = 72072192.

The previous prime is 180961777. The next prime is 180961789. The reversal of 180961780 is 87169081.

It can be written as a sum of positive squares in 4 ways, for example, as 5476 + 180956304 = 74^2 + 13452^2 .

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (180961789) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 14757 + ... + 24076.

It is an arithmetic number, because the mean of its divisors is an integer number (15902523).

Almost surely, 2^180961780 is an apocalyptic number.

180961780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

180961780 is an abundant number, since it is smaller than the sum of its proper divisors (200698772).

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

180961780 is a wasteful number, since it uses less digits than its factorization.

180961780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39075 (or 39073 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 40.

The square root of 180961780 is about 13452.2035369675. The cubic root of 180961780 is about 565.6254644441.

The spelling of 180961780 in words is "one hundred eighty million, nine hundred sixty-one thousand, seven hundred eighty".