180728388 has 96 divisors (see below), whose sum is σ = 504913920. Its totient is φ = 55740960.

The previous prime is 180728371. The next prime is 180728389. The reversal of 180728388 is 883827081.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (180728389) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 75831 + ... + 78177.

It is an arithmetic number, because the mean of its divisors is an integer number (5259520).

Almost surely, 2^180728388 is an apocalyptic number.

180728388 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 180728388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (252456960).

180728388 is an abundant number, since it is smaller than the sum of its proper divisors (324185532).

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

180728388 is a wasteful number, since it uses less digits than its factorization.

180728388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2414 (or 2406 counting only the distinct ones).

The product of its (nonzero) digits is 172032, while the sum is 45.

The square root of 180728388 is about 13443.5258767929. The cubic root of 180728388 is about 565.3821916149.

The spelling of 180728388 in words is "one hundred eighty million, seven hundred twenty-eight thousand, three hundred eighty-eight".