23156978 has 8 divisors (see below), whose sum is σ = 37407468. Its totient is φ = 10687824.

The previous prime is 23156971. The next prime is 23156981. The reversal of 23156978 is 87965132.

It can be written as a sum of positive squares in 2 ways, for example, as 23107249 + 49729 = 4807^2 + 223^2 .

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

It is not an unprimeable number, because it can be changed into a prime (23156971) 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, 445301 + ... + 445352.

Almost surely, 2^23156978 is an apocalyptic number.

23156978 is a deficient number, since it is larger than the sum of its proper divisors (14250490).

23156978 is a wasteful number, since it uses less digits than its factorization.

23156978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 890668.

The product of its digits is 90720, while the sum is 41.

The square root of 23156978 is about 4812.1697808785. The cubic root of 23156978 is about 285.0322237085.

The spelling of 23156978 in words is "twenty-three million, one hundred fifty-six thousand, nine hundred seventy-eight".