28938623 has 8 divisors (see below), whose sum is σ = 34510848. Its totient is φ = 23725944.

The previous prime is 28938619. The next prime is 28938629. The reversal of 28938623 is 32683982.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28938623 - 2² = 28938619 is a prime.

It is a super-2 number, since 2×28938623² = 1674887802272258, 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 (28938629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89711 + ... + 90032.

It is an arithmetic number, because the mean of its divisors is an integer number (4313856).

Almost surely, 2^28938623 is an apocalyptic number.

28938623 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

28938623 is a deficient number, since it is larger than the sum of its proper divisors (5572225).

28938623 is a wasteful number, since it uses less digits than its factorization.

28938623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179773.

The product of its digits is 124416, while the sum is 41.

The square root of 28938623 is about 5379.4630772968. The cubic root of 28938623 is about 307.0147828226.

The spelling of 28938623 in words is "twenty-eight million, nine hundred thirty-eight thousand, six hundred twenty-three".