28900623 has 4 divisors (see below), whose sum is σ = 38534168. Its totient is φ = 19267080.

The previous prime is 28900607. The next prime is 28900631. The reversal of 28900623 is 32600982.

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

It is not a de Polignac number, because 28900623 - 2⁴ = 28900607 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 (28900633) 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, 4816768 + ... + 4816773.

It is an arithmetic number, because the mean of its divisors is an integer number (9633542).

Almost surely, 2^28900623 is an apocalyptic number.

28900623 is a deficient number, since it is larger than the sum of its proper divisors (9633545).

28900623 is an equidigital number, since it uses as much as digits as its factorization.

28900623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9633544.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 28900623 is about 5375.9299660617. The cubic root of 28900623 is about 306.8803411340.

The spelling of 28900623 in words is "twenty-eight million, nine hundred thousand, six hundred twenty-three".