25428848640 has 624 divisors, whose sum is σ = 92095672320. Its totient is φ = 5980815360.

The previous prime is 25428848633. The next prime is 25428848677. The reversal of 25428848640 is 4684882452.

It is a tau number, because it is divible by the number of its divisors (624).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 321884121 + ... + 321884199.

Almost surely, 2^25428848640 is an apocalyptic number.

25428848640 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 25428848640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46047836160).

25428848640 is an abundant number, since it is smaller than the sum of its proper divisors (66666823680).

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

25428848640 is a wasteful number, since it uses less digits than its factorization.

25428848640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168 (or 133 counting only the distinct ones).

The product of its (nonzero) digits is 3932160, while the sum is 51.

The spelling of 25428848640 in words is "twenty-five billion, four hundred twenty-eight million, eight hundred forty-eight thousand, six hundred forty".