128840456 has 32 divisors (see below), whose sum is σ = 247247640. Its totient is φ = 62919168.

The previous prime is 128840447. The next prime is 128840461. The reversal of 128840456 is 654048821.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 91508356 + 37332100 = 9566^2 + 6110^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116900 + ... + 117996.

Almost surely, 2^128840456 is an apocalyptic number.

It is an amenable number.

128840456 is a deficient number, since it is larger than the sum of its proper divisors (118407184).

128840456 is a wasteful number, since it uses less digits than its factorization.

128840456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1433 (or 1429 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 38.

The square root of 128840456 is about 11350.7909856538. The cubic root of 128840456 is about 505.0690439206.

The spelling of 128840456 in words is "one hundred twenty-eight million, eight hundred forty thousand, four hundred fifty-six".