28923689 has 4 divisors (see below), whose sum is σ = 28938624. Its totient is φ = 28908756.

The previous prime is 28923679. The next prime is 28923691. The reversal of 28923689 is 98632982.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28923689 - 2²⁴ = 12146473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28923679) 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, 4037 + ... + 8610.

It is an arithmetic number, because the mean of its divisors is an integer number (7234656).

Almost surely, 2^28923689 is an apocalyptic number.

It is an amenable number.

28923689 is a deficient number, since it is larger than the sum of its proper divisors (14935).

28923689 is a wasteful number, since it uses less digits than its factorization.

28923689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14934.

The product of its digits is 373248, while the sum is 47.

The square root of 28923689 is about 5378.0748414279. The cubic root of 28923689 is about 306.9619612849.

The spelling of 28923689 in words is "twenty-eight million, nine hundred twenty-three thousand, six hundred eighty-nine".