128735957 has 4 divisors (see below), whose sum is σ = 147126816. Its totient is φ = 110345100.

The previous prime is 128735891. The next prime is 128735977. The reversal of 128735957 is 759537821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 128735957 - 2¹² = 128731861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128735977) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9195419 + ... + 9195432.

It is an arithmetic number, because the mean of its divisors is an integer number (36781704).

Almost surely, 2^128735957 is an apocalyptic number.

It is an amenable number.

128735957 is a deficient number, since it is larger than the sum of its proper divisors (18390859).

128735957 is an equidigital number, since it uses as much as digits as its factorization.

128735957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18390858.

The product of its digits is 529200, while the sum is 47.

The square root of 128735957 is about 11346.1868925203. The cubic root of 128735957 is about 504.9324577184.

The spelling of 128735957 in words is "one hundred twenty-eight million, seven hundred thirty-five thousand, nine hundred fifty-seven".