128699056 has 20 divisors (see below), whose sum is σ = 249740712. Its totient is φ = 64249856.

The previous prime is 128699017. The next prime is 128699057. The reversal of 128699056 is 650996821.

It is a super-2 number, since 2×128699056² = 33126894030582272, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 128698997 and 128699015.

It is not an unprimeable number, because it can be changed into a prime (128699057) 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, 5040 + ... + 16816.

Almost surely, 2^128699056 is an apocalyptic number.

128699056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

128699056 is a deficient number, since it is larger than the sum of its proper divisors (121041656).

128699056 is a wasteful number, since it uses less digits than its factorization.

128699056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12468 (or 12462 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 46.

The square root of 128699056 is about 11344.5606349475. The cubic root of 128699056 is about 504.8842083310.

The spelling of 128699056 in words is "one hundred twenty-eight million, six hundred ninety-nine thousand, fifty-six".