25805857400 has 96 divisors (see below), whose sum is σ = 62927267040. Its totient is φ = 9823080960.

The previous prime is 25805857397. The next prime is 25805857457. The reversal of 25805857400 is 475850852.

It is a super-2 number, since 2×25805857400² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 891962 + ... + 920438.

It is an arithmetic number, because the mean of its divisors is an integer number (655492365).

Almost surely, 2^25805857400 is an apocalyptic number.

25805857400 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 25805857400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31463633520).

25805857400 is an abundant number, since it is smaller than the sum of its proper divisors (37121409640).

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

25805857400 is a wasteful number, since it uses less digits than its factorization.

25805857400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28713 (or 28704 counting only the distinct ones).

The product of its (nonzero) digits is 448000, while the sum is 44.

The spelling of 25805857400 in words is "twenty-five billion, eight hundred five million, eight hundred fifty-seven thousand, four hundred".