28904623 has 4 divisors (see below), whose sum is σ = 31532328. Its totient is φ = 26276920.

The previous prime is 28904621. The next prime is 28904639. The reversal of 28904623 is 32640982.

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 28904623 - 2¹ = 28904621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28904621) 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, 1313836 + ... + 1313857.

It is an arithmetic number, because the mean of its divisors is an integer number (7883082).

Almost surely, 2^28904623 is an apocalyptic number.

28904623 is a deficient number, since it is larger than the sum of its proper divisors (2627705).

28904623 is a wasteful number, since it uses less digits than its factorization.

28904623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2627704.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 28904623 is about 5376.3019818459. The cubic root of 28904623 is about 306.8944984382.

The spelling of 28904623 in words is "twenty-eight million, nine hundred four thousand, six hundred twenty-three".