28919427 has 8 divisors (see below), whose sum is σ = 38659920. Its totient is φ = 19229280.

The previous prime is 28919399. The next prime is 28919447. The reversal of 28919427 is 72491982.

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

It is not a de Polignac number, because 28919427 - 2⁸ = 28919171 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28919447) 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, 11224 + ... + 13557.

It is an arithmetic number, because the mean of its divisors is an integer number (4832490).

Almost surely, 2^28919427 is an apocalyptic number.

28919427 is a deficient number, since it is larger than the sum of its proper divisors (9740493).

28919427 is a wasteful number, since it uses less digits than its factorization.

28919427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25173.

The product of its digits is 72576, while the sum is 42.

The square root of 28919427 is about 5377.6785883874. The cubic root of 28919427 is about 306.9468832619.

The spelling of 28919427 in words is "twenty-eight million, nine hundred nineteen thousand, four hundred twenty-seven".