28478023 has 6 divisors (see below), whose sum is σ = 32562456. Its totient is φ = 24397632.

The previous prime is 28478003. The next prime is 28478039. The reversal of 28478023 is 32087482.

It is a de Polignac number, because none of the positive numbers 2^k-28478023 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28478023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28478003) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13111 + ... + 15127.

It is an arithmetic number, because the mean of its divisors is an integer number (5427076).

Almost surely, 2^28478023 is an apocalyptic number.

28478023 is a deficient number, since it is larger than the sum of its proper divisors (4084433).

28478023 is an frugal number, since it uses more digits than its factorization.

28478023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4041 (or 2024 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 34.

The square root of 28478023 is about 5336.4803944173. The cubic root of 28478023 is about 305.3772023959.

The spelling of 28478023 in words is "twenty-eight million, four hundred seventy-eight thousand, twenty-three".