23456578 has 4 divisors (see below), whose sum is σ = 35184870. Its totient is φ = 11728288.

The previous prime is 23456569. The next prime is 23456597. The reversal of 23456578 is 87565432.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20313049 + 3143529 = 4507^2 + 1773^2 .

It is a super-2 number, since 2×23456578² = 1100422102940168, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 23456578.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5864143 + ... + 5864146.

Almost surely, 2^23456578 is an apocalyptic number.

23456578 is a deficient number, since it is larger than the sum of its proper divisors (11728292).

23456578 is a wasteful number, since it uses less digits than its factorization.

23456578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11728291.

The product of its digits is 201600, while the sum is 40.

The square root of 23456578 is about 4843.1991493227. The cubic root of 23456578 is about 286.2561888532.

The spelling of 23456578 in words is "twenty-three million, four hundred fifty-six thousand, five hundred seventy-eight".