25257890860 has 12 divisors (see below), whose sum is σ = 53041570848. Its totient is φ = 10103156336.

The previous prime is 25257890857. The next prime is 25257890869. The reversal of 25257890860 is 6809875252.

It is a super-2 number, since 2×25257890860² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25257890798 and 25257890807.

It is not an unprimeable number, because it can be changed into a prime (25257890869) 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, 631447252 + ... + 631447291.

It is an arithmetic number, because the mean of its divisors is an integer number (4420130904).

Almost surely, 2^25257890860 is an apocalyptic number.

25257890860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25257890860 is an abundant number, since it is smaller than the sum of its proper divisors (27783679988).

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

25257890860 is a wasteful number, since it uses less digits than its factorization.

25257890860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1262894552 (or 1262894550 counting only the distinct ones).

The product of its (nonzero) digits is 2419200, while the sum is 52.

The spelling of 25257890860 in words is "twenty-five billion, two hundred fifty-seven million, eight hundred ninety thousand, eight hundred sixty".