25397097728 has 36 divisors (see below), whose sum is σ = 51931472628. Its totient is φ = 12388823040.

The previous prime is 25397097721. The next prime is 25397097731. The reversal of 25397097728 is 82779079352.

It can be written as a sum of positive squares in 2 ways, for example, as 3360289024 + 22036808704 = 57968^2 + 148448^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25397097721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1199351 + ... + 1220342.

Almost surely, 2^25397097728 is an apocalyptic number.

It is an amenable number.

25397097728 is an abundant number, since it is smaller than the sum of its proper divisors (26534374900).

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

25397097728 is an equidigital number, since it uses as much as digits as its factorization.

25397097728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2419750 (or 2419736 counting only the distinct ones).

The product of its (nonzero) digits is 13335840, while the sum is 59.

The spelling of 25397097728 in words is "twenty-five billion, three hundred ninety-seven million, ninety-seven thousand, seven hundred twenty-eight".