28861623 has 32 divisors (see below), whose sum is σ = 49510400. Its totient is φ = 16275168.

The previous prime is 28861607. The next prime is 28861667. The reversal of 28861623 is 32616882.

28861623 is a `hidden beast` number, since 28 + 8 + 6 + 1 + 623 = 666.

It is not a de Polignac number, because 28861623 - 2⁴ = 28861607 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 (28861603) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13965 + ... + 15897.

It is an arithmetic number, because the mean of its divisors is an integer number (1547200).

Almost surely, 2^28861623 is an apocalyptic number.

28861623 is a deficient number, since it is larger than the sum of its proper divisors (20648777).

28861623 is a wasteful number, since it uses less digits than its factorization.

28861623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2028 (or 2022 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 28861623 is about 5372.3014621296. The cubic root of 28861623 is about 306.7422389103.

The spelling of 28861623 in words is "twenty-eight million, eight hundred sixty-one thousand, six hundred twenty-three".