23128730 has 8 divisors (see below), whose sum is σ = 41631732. Its totient is φ = 9251488.

The previous prime is 23128717. The next prime is 23128733. The reversal of 23128730 is 3782132.

It can be written as a sum of positive squares in 2 ways, for example, as 22287841 + 840889 = 4721^2 + 917^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 23128730.

It is not an unprimeable number, because it can be changed into a prime (23128733) 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, 1156427 + ... + 1156446.

Almost surely, 2^23128730 is an apocalyptic number.

23128730 is a deficient number, since it is larger than the sum of its proper divisors (18503002).

23128730 is a wasteful number, since it uses less digits than its factorization.

23128730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2312880.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 23128730 is about 4809.2338267129. The cubic root of 23128730 is about 284.9162778601.

The spelling of 23128730 in words is "twenty-three million, one hundred twenty-eight thousand, seven hundred thirty".