23128978 has 8 divisors (see below), whose sum is σ = 34843068. Its totient is φ = 11514624.

The previous prime is 23128951. The next prime is 23128981. The reversal of 23128978 is 87982132.

It can be written as a sum of positive squares in 2 ways, for example, as 21132409 + 1996569 = 4597^2 + 1413^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 23128978.

It is an unprimeable number.

It is an upside-down number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24351 + ... + 25282.

Almost surely, 2^23128978 is an apocalyptic number.

23128978 is a deficient number, since it is larger than the sum of its proper divisors (11714090).

23128978 is a wasteful number, since it uses less digits than its factorization.

23128978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49868.

The product of its digits is 48384, while the sum is 40.

The square root of 23128978 is about 4809.2596103766. The cubic root of 23128978 is about 284.9172962037.

It can be divided in two parts, 2312 and 8978, that multiplied together give a square (20757136 = 4556²).

The spelling of 23128978 in words is "twenty-three million, one hundred twenty-eight thousand, nine hundred seventy-eight".