28432923 has 8 divisors (see below), whose sum is σ = 37935936. Its totient is φ = 18942600.

The previous prime is 28432913. The next prime is 28432981. The reversal of 28432923 is 32923482.

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

It is not a de Polignac number, because 28432923 - 2²⁰ = 27384347 is a prime.

It is a super-2 number, since 2×28432923² = 1616862220647858, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28432913) 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, 5268 + ... + 9198.

It is an arithmetic number, because the mean of its divisors is an integer number (4741992).

Almost surely, 2^28432923 is an apocalyptic number.

28432923 is a deficient number, since it is larger than the sum of its proper divisors (9503013).

28432923 is a wasteful number, since it uses less digits than its factorization.

28432923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6345.

The product of its digits is 20736, while the sum is 33.

The square root of 28432923 is about 5332.2530885171. The cubic root of 28432923 is about 305.2159109018.

The spelling of 28432923 in words is "twenty-eight million, four hundred thirty-two thousand, nine hundred twenty-three".