180721380 has 48 divisors (see below), whose sum is σ = 578309760. Its totient is φ = 41307648.

The previous prime is 180721367. The next prime is 180721397. The reversal of 180721380 is 83127081.

It is a happy number.

180721380 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 214725 + ... + 215564.

It is an arithmetic number, because the mean of its divisors is an integer number (12048120).

Almost surely, 2^180721380 is an apocalyptic number.

180721380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

180721380 is an abundant number, since it is smaller than the sum of its proper divisors (397588380).

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

180721380 is a wasteful number, since it uses less digits than its factorization.

180721380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430308 (or 430306 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 180721380 is about 13443.2652283588. The cubic root of 180721380 is about 565.3748836879.

The spelling of 180721380 in words is "one hundred eighty million, seven hundred twenty-one thousand, three hundred eighty".