28748623 has 4 divisors (see below), whose sum is σ = 28761040. Its totient is φ = 28736208.

The previous prime is 28748611. The next prime is 28748633. The reversal of 28748623 is 32684782.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 28748623 - 2¹⁷ = 28617551 is a prime.

It is a super-2 number, since 2×28748623² = 1652966648792258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28748633) 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, 1590 + ... + 7747.

It is an arithmetic number, because the mean of its divisors is an integer number (7190260).

Almost surely, 2^28748623 is an apocalyptic number.

28748623 is a deficient number, since it is larger than the sum of its proper divisors (12417).

28748623 is an equidigital number, since it uses as much as digits as its factorization.

28748623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12416.

The product of its digits is 129024, while the sum is 40.

The square root of 28748623 is about 5361.7742399322. The cubic root of 28748623 is about 306.3413927983.

The spelling of 28748623 in words is "twenty-eight million, seven hundred forty-eight thousand, six hundred twenty-three".