128520956 has 12 divisors (see below), whose sum is σ = 226629480. Its totient is φ = 63769680.

The previous prime is 128520949. The next prime is 128520971. The reversal of 128520956 is 659025821.

It is a super-2 number, since 2×128520956² = 33035272262307872, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122111 + ... + 123158.

It is an arithmetic number, because the mean of its divisors is an integer number (18885790).

Almost surely, 2^128520956 is an apocalyptic number.

It is an amenable number.

128520956 is a deficient number, since it is larger than the sum of its proper divisors (98108524).

128520956 is a wasteful number, since it uses less digits than its factorization.

128520956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245404 (or 245402 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 128520956 is about 11336.7083406075. The cubic root of 128520956 is about 504.6512063943.

The spelling of 128520956 in words is "one hundred twenty-eight million, five hundred twenty thousand, nine hundred fifty-six".