180420928 has 28 divisors (see below), whose sum is σ = 358495092. Its totient is φ = 90091520.

The previous prime is 180420857. The next prime is 180420953. The reversal of 180420928 is 829024081.

It can be written as a sum of positive squares in 2 ways, for example, as 118200384 + 62220544 = 10872^2 + 7888^2 .

It is a super-2 number, since 2×180420928² = 65103422520762368, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 180420893 and 180420902.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66576 + ... + 69232.

Almost surely, 2^180420928 is an apocalyptic number.

It is an amenable number.

180420928 is a deficient number, since it is larger than the sum of its proper divisors (178074164).

180420928 is a wasteful number, since it uses less digits than its factorization.

180420928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3730 (or 3720 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 180420928 is about 13432.0857650627. The cubic root of 180420928 is about 565.0613951609.

The spelling of 180420928 in words is "one hundred eighty million, four hundred twenty thousand, nine hundred twenty-eight".