128840425 has 24 divisors (see below), whose sum is σ = 192200000. Its totient is φ = 83695680.

The previous prime is 128840423. The next prime is 128840429. The reversal of 128840425 is 524048821.

It is not a de Polignac number, because 128840425 - 2¹ = 128840423 is a prime.

It is a super-2 number, since 2×128840425² = 33199710228361250, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (128840423) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16050 + ... + 22699.

Almost surely, 2^128840425 is an apocalyptic number.

It is an amenable number.

128840425 is a deficient number, since it is larger than the sum of its proper divisors (63359575).

128840425 is a wasteful number, since it uses less digits than its factorization.

128840425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38785 (or 38780 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 34.

The square root of 128840425 is about 11350.7896201101. The cubic root of 128840425 is about 505.0690034128.

The spelling of 128840425 in words is "one hundred twenty-eight million, eight hundred forty thousand, four hundred twenty-five".