28446732180 has 36 divisors (see below), whose sum is σ = 86288421492. Its totient is φ = 7585795200.

The previous prime is 28446732161. The next prime is 28446732191. The reversal of 28446732180 is 8123764482.

It is a happy number.

28446732180 is a `hidden beast` number, since 2 + 8 + 4 + 467 + 3 + 2 + 180 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 17644871556 + 10801860624 = 132834^2 + 103932^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent 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, 79018521 + ... + 79018880.

It is an arithmetic number, because the mean of its divisors is an integer number (2396900597).

Almost surely, 2^28446732180 is an apocalyptic number.

28446732180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28446732180 is an abundant number, since it is smaller than the sum of its proper divisors (57841689312).

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

28446732180 is a wasteful number, since it uses less digits than its factorization.

28446732180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158037416 (or 158037411 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 45.

The spelling of 28446732180 in words is "twenty-eight billion, four hundred forty-six million, seven hundred thirty-two thousand, one hundred eighty".