128997536 has 24 divisors (see below), whose sum is σ = 267331680. Its totient is φ = 61103808.

The previous prime is 128997511. The next prime is 128997553. The reversal of 128997536 is 635799821.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105476 + ... + 106691.

It is an arithmetic number, because the mean of its divisors is an integer number (11138820).

Almost surely, 2^128997536 is an apocalyptic number.

128997536 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

128997536 is an abundant number, since it is smaller than the sum of its proper divisors (138334144).

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

128997536 is a wasteful number, since it uses less digits than its factorization.

128997536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212196 (or 212188 counting only the distinct ones).

The product of its digits is 816480, while the sum is 50.

The square root of 128997536 is about 11357.7082195309. The cubic root of 128997536 is about 505.2742176368.

The spelling of 128997536 in words is "one hundred twenty-eight million, nine hundred ninety-seven thousand, five hundred thirty-six".