25428908440 has 64 divisors (see below), whose sum is σ = 62484125760. Its totient is φ = 9256880640.

The previous prime is 25428908437. The next prime is 25428908441. The reversal of 25428908440 is 4480982452.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25428908441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 307459 + ... + 381298.

It is an arithmetic number, because the mean of its divisors is an integer number (976314465).

Almost surely, 2^25428908440 is an apocalyptic number.

25428908440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25428908440 is an abundant number, since it is smaller than the sum of its proper divisors (37055217320).

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

25428908440 is a wasteful number, since it uses less digits than its factorization.

25428908440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 688852 (or 688848 counting only the distinct ones).

The product of its (nonzero) digits is 737280, while the sum is 46.

The spelling of 25428908440 in words is "twenty-five billion, four hundred twenty-eight million, nine hundred eight thousand, four hundred forty".