128890025 has 12 divisors (see below), whose sum is σ = 174353424. Its totient is φ = 93738000.

The previous prime is 128889997. The next prime is 128890057. The reversal of 128890025 is 520098821.

It is not a de Polignac number, because 128890025 - 2¹⁸ = 128627881 is a prime.

It is a super-2 number, since 2×128890025² = 33225277089001250, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 234071 + ... + 234620.

It is an arithmetic number, because the mean of its divisors is an integer number (14529452).

Almost surely, 2^128890025 is an apocalyptic number.

It is an amenable number.

128890025 is a deficient number, since it is larger than the sum of its proper divisors (45463399).

128890025 is a wasteful number, since it uses less digits than its factorization.

128890025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468712 (or 468707 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 128890025 is about 11352.9742798969. The cubic root of 128890025 is about 505.1338076297.

The spelling of 128890025 in words is "one hundred twenty-eight million, eight hundred ninety thousand, twenty-five".