128791751 has 8 divisors (see below), whose sum is σ = 143768064. Its totient is φ = 114360120.

The previous prime is 128791739. The next prime is 128791757. The reversal of 128791751 is 157197821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128791751 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 128791699 and 128791708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128791757) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135671 + ... + 136616.

It is an arithmetic number, because the mean of its divisors is an integer number (17971008).

Almost surely, 2^128791751 is an apocalyptic number.

128791751 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

128791751 is a deficient number, since it is larger than the sum of its proper divisors (14976313).

128791751 is a wasteful number, since it uses less digits than its factorization.

128791751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272341.

The product of its digits is 35280, while the sum is 41.

The square root of 128791751 is about 11348.6453376604. The cubic root of 128791751 is about 505.0053928777.

The spelling of 128791751 in words is "one hundred twenty-eight million, seven hundred ninety-one thousand, seven hundred fifty-one".