25391996928 has 168 divisors, whose sum is σ = 73605542400. Its totient is φ = 8434581504.

The previous prime is 25391996923. The next prime is 25391996933. The reversal of 25391996928 is 82969919352.

25391996928 is a `hidden beast` number, since 2 + 539 + 1 + 9 + 9 + 6 + 92 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (25391996923) and next prime (25391996933).

It is a super-2 number, since 2×25391996928² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25391996923) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35315353 + ... + 35316071.

Almost surely, 2^25391996928 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 25391996928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36802771200).

25391996928 is an abundant number, since it is smaller than the sum of its proper divisors (48213545472).

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

25391996928 is an equidigital number, since it uses as much as digits as its factorization.

25391996928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1230 (or 1203 counting only the distinct ones).

The product of its digits is 18895680, while the sum is 63.

The spelling of 25391996928 in words is "twenty-five billion, three hundred ninety-one million, nine hundred ninety-six thousand, nine hundred twenty-eight".