25398973728 has 54 divisors (see below), whose sum is σ = 72236023587. Its totient is φ = 8465423040.

The previous prime is 25398973697. The next prime is 25398973741. The reversal of 25398973728 is 82737989352.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

25398973728 is a `hidden beast` number, since 2 + 539 + 8 + 9 + 73 + 7 + 28 = 666.

It can be written as a sum of positive squares in only one way, i.e., 12699486864 + 12699486864 = 112692^2 + 112692^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=112692.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2699913 + ... + 2709303.

Almost surely, 2^25398973728 is an apocalyptic number.

It is an amenable number.

25398973728 is an abundant number, since it is smaller than the sum of its proper divisors (46837049859).

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

25398973728 is an frugal number, since it uses more digits than its factorization.

25398973728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18798 (or 9396 counting only the distinct ones).

The product of its digits is 45722880, while the sum is 63.

The spelling of 25398973728 in words is "twenty-five billion, three hundred ninety-eight million, nine hundred seventy-three thousand, seven hundred twenty-eight".