128537997 has 32 divisors (see below), whose sum is σ = 206536704. Its totient is φ = 69552000.

The previous prime is 128537989. The next prime is 128538013. The reversal of 128537997 is 799735821.

It is not a de Polignac number, because 128537997 - 2³ = 128537989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128537917) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28497 + ... + 32697.

It is an arithmetic number, because the mean of its divisors is an integer number (6454272).

Almost surely, 2^128537997 is an apocalyptic number.

It is an amenable number.

128537997 is a deficient number, since it is larger than the sum of its proper divisors (77998707).

128537997 is a wasteful number, since it uses less digits than its factorization.

128537997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4289.

The product of its digits is 952560, while the sum is 51.

The square root of 128537997 is about 11337.4599007009. The cubic root of 128537997 is about 504.6735098417.

The spelling of 128537997 in words is "one hundred twenty-eight million, five hundred thirty-seven thousand, nine hundred ninety-seven".