25555550028 has 24 divisors (see below), whose sum is σ = 60009427632. Its totient is φ = 8464257984.

The previous prime is 25555550021. The next prime is 25555550039. The reversal of 25555550028 is 82005555552.

It is a super-2 number, since 2×25555550028² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25555550021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6780375 + ... + 6784142.

It is an arithmetic number, because the mean of its divisors is an integer number (2500392818).

Almost surely, 2^25555550028 is an apocalyptic number.

It is an amenable number.

25555550028 is an abundant number, since it is smaller than the sum of its proper divisors (34453877604).

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

25555550028 is a wasteful number, since it uses less digits than its factorization.

25555550028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13564681 (or 13564679 counting only the distinct ones).

The product of its (nonzero) digits is 500000, while the sum is 42.

The spelling of 25555550028 in words is "twenty-five billion, five hundred fifty-five million, five hundred fifty thousand, twenty-eight".