28729923 has 8 divisors (see below), whose sum is σ = 39627600. Its totient is φ = 18492768.

The previous prime is 28729913. The next prime is 28729927. The reversal of 28729923 is 32992782.

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

It is not a de Polignac number, because 28729923 - 2⁴ = 28729907 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28729927) 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, 165028 + ... + 165201.

It is an arithmetic number, because the mean of its divisors is an integer number (4953450).

Almost surely, 2^28729923 is an apocalyptic number.

28729923 is a deficient number, since it is larger than the sum of its proper divisors (10897677).

28729923 is a wasteful number, since it uses less digits than its factorization.

28729923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330261.

The product of its digits is 108864, while the sum is 42.

The square root of 28729923 is about 5360.0301305123. The cubic root of 28729923 is about 306.2749568444.

The spelling of 28729923 in words is "twenty-eight million, seven hundred twenty-nine thousand, nine hundred twenty-three".