128995503 has 48 divisors (see below), whose sum is σ = 224167680. Its totient is φ = 64426752.

The previous prime is 128995487. The next prime is 128995543. The reversal of 128995503 is 305599821.

It is not a de Polignac number, because 128995503 - 2⁴ = 128995487 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128995543) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 66475 + ... + 68387.

It is an arithmetic number, because the mean of its divisors is an integer number (4670160).

Almost surely, 2^128995503 is an apocalyptic number.

128995503 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

128995503 is a deficient number, since it is larger than the sum of its proper divisors (95172177).

128995503 is a wasteful number, since it uses less digits than its factorization.

128995503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1968 (or 1955 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 42.

The square root of 128995503 is about 11357.6187204889. The cubic root of 128995503 is about 505.2715632505.

The spelling of 128995503 in words is "one hundred twenty-eight million, nine hundred ninety-five thousand, five hundred three".