25357564728 has 128 divisors (see below), whose sum is σ = 71897088000. Its totient is φ = 8279107200.

The previous prime is 25357564679. The next prime is 25357564741. The reversal of 25357564728 is 82746575352.

25357564728 is a `hidden beast` number, since 2 + 5 + 3 + 5 + 7 + 564 + 72 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 2161278 + ... + 2172978.

It is an arithmetic number, because the mean of its divisors is an integer number (561696000).

Almost surely, 2^25357564728 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 25357564728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35948544000).

25357564728 is an abundant number, since it is smaller than the sum of its proper divisors (46539523272).

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

25357564728 is a wasteful number, since it uses less digits than its factorization.

25357564728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11922 (or 11912 counting only the distinct ones).

The product of its digits is 14112000, while the sum is 54.

The spelling of 25357564728 in words is "twenty-five billion, three hundred fifty-seven million, five hundred sixty-four thousand, seven hundred twenty-eight".