23428987 has 4 divisors (see below), whose sum is σ = 23465520. Its totient is φ = 23392456.

The previous prime is 23428981. The next prime is 23428997. The reversal of 23428987 is 78982432.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 23428987 - 2²³ = 15040379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23428981) 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, 17287 + ... + 18592.

It is an arithmetic number, because the mean of its divisors is an integer number (5866380).

Almost surely, 2^23428987 is an apocalyptic number.

23428987 is a deficient number, since it is larger than the sum of its proper divisors (36533).

23428987 is an equidigital number, since it uses as much as digits as its factorization.

23428987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36532.

The product of its digits is 193536, while the sum is 43.

The square root of 23428987 is about 4840.3498840476. The cubic root of 23428987 is about 286.1439077230.

The spelling of 23428987 in words is "twenty-three million, four hundred twenty-eight thousand, nine hundred eighty-seven".