28897623 has 6 divisors (see below), whose sum is σ = 41741024. Its totient is φ = 19265076.

The previous prime is 28897607. The next prime is 28897633. The reversal of 28897623 is 32679882.

It is not a de Polignac number, because 28897623 - 2⁴ = 28897607 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 (28897633) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1605415 + ... + 1605432.

Almost surely, 2^28897623 is an apocalyptic number.

28897623 is a deficient number, since it is larger than the sum of its proper divisors (12843401).

28897623 is a wasteful number, since it uses less digits than its factorization.

28897623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3210853 (or 3210850 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 28897623 is about 5375.6509373284. The cubic root of 28897623 is about 306.8697222985.

The spelling of 28897623 in words is "twenty-eight million, eight hundred ninety-seven thousand, six hundred twenty-three".