25628405280 has 192 divisors, whose sum is σ = 81615340800. Its totient is φ = 6759673856.

The previous prime is 25628405221. The next prime is 25628405321. The reversal of 25628405280 is 8250482652.

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, 20954749 + ... + 20955971.

It is an arithmetic number, because the mean of its divisors is an integer number (425079900).

Almost surely, 2^25628405280 is an apocalyptic number.

25628405280 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 25628405280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40807670400).

25628405280 is an abundant number, since it is smaller than the sum of its proper divisors (55986935520).

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

25628405280 is a wasteful number, since it uses less digits than its factorization.

25628405280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1683 (or 1675 counting only the distinct ones).

The product of its (nonzero) digits is 307200, while the sum is 42.

The spelling of 25628405280 in words is "twenty-five billion, six hundred twenty-eight million, four hundred five thousand, two hundred eighty".