128291723 has 16 divisors (see below), whose sum is σ = 155513856. Its totient is φ = 103451040.

The previous prime is 128291711. The next prime is 128291729. The reversal of 128291723 is 327192821.

It is not a de Polignac number, because 128291723 - 2⁸ = 128291467 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128291729) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3290 + ... + 16352.

It is an arithmetic number, because the mean of its divisors is an integer number (9719616).

Almost surely, 2^128291723 is an apocalyptic number.

128291723 is a deficient number, since it is larger than the sum of its proper divisors (27222133).

128291723 is a wasteful number, since it uses less digits than its factorization.

128291723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13154.

The product of its digits is 12096, while the sum is 35.

The square root of 128291723 is about 11326.5936185598. The cubic root of 128291723 is about 504.3509919131.

The spelling of 128291723 in words is "one hundred twenty-eight million, two hundred ninety-one thousand, seven hundred twenty-three".