25571428008 has 128 divisors (see below), whose sum is σ = 76977254400. Its totient is φ = 6915227904.

The previous prime is 25571427967. The next prime is 25571428031. The reversal of 25571428008 is 80082417552.

It is a Harshad number since it is a multiple of its sum of digits (42).

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, 4232766 + ... + 4238802.

It is an arithmetic number, because the mean of its divisors is an integer number (601384800).

Almost surely, 2^25571428008 is an apocalyptic number.

25571428008 is a gapful number since it is divisible by the number (28) 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 25571428008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38488627200).

25571428008 is an abundant number, since it is smaller than the sum of its proper divisors (51405826392).

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

25571428008 is a wasteful number, since it uses less digits than its factorization.

25571428008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7399 (or 7395 counting only the distinct ones).

The product of its (nonzero) digits is 179200, while the sum is 42.

The spelling of 25571428008 in words is "twenty-five billion, five hundred seventy-one million, four hundred twenty-eight thousand, eight".