25120663728 has 20 divisors (see below), whose sum is σ = 64895048088. Its totient is φ = 8373554560.

The previous prime is 25120663697. The next prime is 25120663741. The reversal of 25120663728 is 82736602152.

It is a super-2 number, since 2×25120663728² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25120663728.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 261673533 + ... + 261673628.

Almost surely, 2^25120663728 is an apocalyptic number.

It is an amenable number.

25120663728 is an abundant number, since it is smaller than the sum of its proper divisors (39774384360).

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

25120663728 is a wasteful number, since it uses less digits than its factorization.

25120663728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523347172 (or 523347166 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 42.

The spelling of 25120663728 in words is "twenty-five billion, one hundred twenty million, six hundred sixty-three thousand, seven hundred twenty-eight".