23042728 has 8 divisors (see below), whose sum is σ = 43205130. Its totient is φ = 11521360.

The previous prime is 23042713. The next prime is 23042729. The reversal of 23042728 is 82724032.

It can be written as a sum of positive squares in only one way, i.e., 22829284 + 213444 = 4778^2 + 462^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 23042696 and 23042705.

It is not an unprimeable number, because it can be changed into a prime (23042729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1440163 + ... + 1440178.

Almost surely, 2^23042728 is an apocalyptic number.

It is an amenable number.

23042728 is a deficient number, since it is larger than the sum of its proper divisors (20162402).

23042728 is a wasteful number, since it uses less digits than its factorization.

23042728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2880347 (or 2880343 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 23042728 is about 4800.2841582556. The cubic root of 23042728 is about 284.5626944773.

The spelling of 23042728 in words is "twenty-three million, forty-two thousand, seven hundred twenty-eight".