180638730 has 24 divisors (see below), whose sum is σ = 469660932. Its totient is φ = 48170304.

The previous prime is 180638729. The next prime is 180638789. The reversal of 180638730 is 37836081.

180638730 is a `hidden beast` number, since 18 + 0 + 638 + 7 + 3 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 165405321 + 15233409 = 12861^2 + 3903^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1003459 + ... + 1003638.

Almost surely, 2^180638730 is an apocalyptic number.

180638730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

180638730 is an abundant number, since it is smaller than the sum of its proper divisors (289022202).

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

180638730 is a wasteful number, since it uses less digits than its factorization.

180638730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2007110 (or 2007107 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 180638730 is about 13440.1908468593. The cubic root of 180638730 is about 565.2886821928.

The spelling of 180638730 in words is "one hundred eighty million, six hundred thirty-eight thousand, seven hundred thirty".