25400307920 has 160 divisors (see below), whose sum is σ = 67745976480. Its totient is φ = 8825856000.

The previous prime is 25400307917. The next prime is 25400307943. The reversal of 25400307920 is 2970300452.

It is a happy number.

It can be written as a sum of positive squares in 16 ways, for example, as 25377764416 + 22543504 = 159304^2 + 4748^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2983670 + ... + 2992170.

It is an arithmetic number, because the mean of its divisors is an integer number (423412353).

Almost surely, 2^25400307920 is an apocalyptic number.

25400307920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25400307920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33872988240).

25400307920 is an abundant number, since it is smaller than the sum of its proper divisors (42345668560).

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

25400307920 is a wasteful number, since it uses less digits than its factorization.

25400307920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8570 (or 8538 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 32.

The spelling of 25400307920 in words is "twenty-five billion, four hundred million, three hundred seven thousand, nine hundred twenty".