28008700164 has 27 divisors (see below), whose sum is σ = 70802308213. Its totient is φ = 9335898672.

The previous prime is 28008700151. The next prime is 28008700199. The reversal of 28008700164 is 46100780082.

The square root of 28008700164 is 167358.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 27992636100 + 16064064 = 167310^2 + 4008^2 .

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

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 990202 + ... + 1018094.

Almost surely, 2^28008700164 is an apocalyptic number.

28008700164 is the 167358-th square number.

It is an amenable number.

28008700164 is an abundant number, since it is smaller than the sum of its proper divisors (42793608049).

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

28008700164 is an frugal number, since it uses more digits than its factorization.

28008700164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55796 (or 27898 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

Multiplying 28008700164 by its sum of digits (36), we get a square (1008313205904 = 1004148²).

28008700164 divided by its sum of digits (36) gives a square (778019449 = 27893²).

The spelling of 28008700164 in words is "twenty-eight billion, eight million, seven hundred thousand, one hundred sixty-four".