128503956 has 48 divisors (see below), whose sum is σ = 343848960. Its totient is φ = 36589920.

The previous prime is 128503937. The next prime is 128503957. The reversal of 128503956 is 659305821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128503957) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23665 + ... + 28583.

It is an arithmetic number, because the mean of its divisors is an integer number (7163520).

Almost surely, 2^128503956 is an apocalyptic number.

It is an amenable number.

128503956 is an abundant number, since it is smaller than the sum of its proper divisors (215345004).

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

128503956 is a wasteful number, since it uses less digits than its factorization.

128503956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5244 (or 5242 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 39.

The square root of 128503956 is about 11335.9585390914. The cubic root of 128503956 is about 504.6289546436.

The spelling of 128503956 in words is "one hundred twenty-eight million, five hundred three thousand, nine hundred fifty-six".