23728913 has 8 divisors (see below), whose sum is σ = 25842600. Its totient is φ = 21656448.

The previous prime is 23728909. The next prime is 23728927. The reversal of 23728913 is 31982732.

It can be written as a sum of positive squares in 4 ways, for example, as 380689 + 23348224 = 617^2 + 4832^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 23728913 - 2² = 23728909 is a prime.

It is a super-2 number, since 2×23728913² = 1126122624323138, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23728013) 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, 9098 + ... + 11411.

It is an arithmetic number, because the mean of its divisors is an integer number (3230325).

Almost surely, 2^23728913 is an apocalyptic number.

It is an amenable number.

23728913 is a deficient number, since it is larger than the sum of its proper divisors (2113687).

23728913 is a wasteful number, since it uses less digits than its factorization.

23728913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20611.

The product of its digits is 18144, while the sum is 35.

The square root of 23728913 is about 4871.2332114158. The cubic root of 23728913 is about 287.3597571834.

The spelling of 23728913 in words is "twenty-three million, seven hundred twenty-eight thousand, nine hundred thirteen".