128290456 has 16 divisors (see below), whose sum is σ = 274908240. Its totient is φ = 54981600.

The previous prime is 128290453. The next prime is 128290469. The reversal of 128290456 is 654092821.

It is a super-2 number, since 2×128290456² = 32916882201375872, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128290453) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1145395 + ... + 1145506.

It is an arithmetic number, because the mean of its divisors is an integer number (17181765).

Almost surely, 2^128290456 is an apocalyptic number.

It is an amenable number.

128290456 is an abundant number, since it is smaller than the sum of its proper divisors (146617784).

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

128290456 is a wasteful number, since it uses less digits than its factorization.

128290456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2290914 (or 2290910 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 128290456 is about 11326.5376881022. The cubic root of 128290456 is about 504.3493315961.

The spelling of 128290456 in words is "one hundred twenty-eight million, two hundred ninety thousand, four hundred fifty-six".