180621864 has 48 divisors (see below), whose sum is σ = 502412820. Its totient is φ = 58579200.

The previous prime is 180621863. The next prime is 180621871. The reversal of 180621864 is 468126081.

It can be written as a sum of positive squares in 2 ways, for example, as 171872100 + 8749764 = 13110^2 + 2958^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (180621863) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31237 + ... + 36564.

Almost surely, 2^180621864 is an apocalyptic number.

It is an amenable number.

180621864 is an abundant number, since it is smaller than the sum of its proper divisors (321790956).

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

180621864 is a wasteful number, since it uses less digits than its factorization.

180621864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67850 (or 67843 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 180621864 is about 13439.5633857652. The cubic root of 180621864 is about 565.2710882257.

The spelling of 180621864 in words is "one hundred eighty million, six hundred twenty-one thousand, eight hundred sixty-four".