28057744080 has 120 divisors (see below), whose sum is σ = 94268931432. Its totient is φ = 7478756352.

The previous prime is 28057744079. The next prime is 28057744123. The reversal of 28057744080 is 8044775082.

28057744080 is a `hidden beast` number, since 2 + 80 + 57 + 7 + 440 + 80 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 986965056 + 27070779024 = 31416^2 + 164532^2 .

It is a tau number, because it is divible by the number of its divisors (120).

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 23 ways as a sum of consecutive naturals, for example, 1920162 + ... + 1934718.

Almost surely, 2^28057744080 is an apocalyptic number.

28057744080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28057744080 is an abundant number, since it is smaller than the sum of its proper divisors (66211187352).

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

28057744080 is a wasteful number, since it uses less digits than its factorization.

28057744080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17253 (or 17244 counting only the distinct ones).

The product of its (nonzero) digits is 501760, while the sum is 45.

The spelling of 28057744080 in words is "twenty-eight billion, fifty-seven million, seven hundred forty-four thousand, eighty".