28172904448 has 96 divisors (see below), whose sum is σ = 61271781480. Its totient is φ = 12872908800.

The previous prime is 28172904421. The next prime is 28172904457. The reversal of 28172904448 is 84440927182.

It can be written as a sum of positive squares in 4 ways, for example, as 27465769984 + 707134464 = 165728^2 + 26592^2 .

It is a super-2 number, since 2×28172904448² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2683786 + ... + 2694262.

Almost surely, 2^28172904448 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28172904448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30635890740).

28172904448 is an abundant number, since it is smaller than the sum of its proper divisors (33098877032).

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

28172904448 is a wasteful number, since it uses less digits than its factorization.

28172904448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10613 (or 10593 counting only the distinct ones).

The product of its (nonzero) digits is 1032192, while the sum is 49.

The spelling of 28172904448 in words is "twenty-eight billion, one hundred seventy-two million, nine hundred four thousand, four hundred forty-eight".