23405428 has 12 divisors (see below), whose sum is σ = 41034532. Its totient is φ = 11681280.

The previous prime is 23405401. The next prime is 23405429. The reversal of 23405428 is 82450432.

It can be written as a sum of positive squares in 2 ways, for example, as 15776784 + 7628644 = 3972^2 + 2762^2 .

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 = 23405396 and 23405405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23405429) 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, 2763 + ... + 7378.

Almost surely, 2^23405428 is an apocalyptic number.

It is an amenable number.

23405428 is a deficient number, since it is larger than the sum of its proper divisors (17629104).

23405428 is a wasteful number, since it uses less digits than its factorization.

23405428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10722 (or 10720 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 28.

The square root of 23405428 is about 4837.9156668962. The cubic root of 23405428 is about 286.0479649614.

The spelling of 23405428 in words is "twenty-three million, four hundred five thousand, four hundred twenty-eight".