28719278 has 16 divisors (see below), whose sum is σ = 49459200. Its totient is φ = 12251736.

The previous prime is 28719277. The next prime is 28719281. The reversal of 28719278 is 87291782.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28719277) 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, 1478 + ... + 7721.

It is an arithmetic number, because the mean of its divisors is an integer number (3091200).

Almost surely, 2^28719278 is an apocalyptic number.

28719278 is a deficient number, since it is larger than the sum of its proper divisors (20739922).

28719278 is a wasteful number, since it uses less digits than its factorization.

28719278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9431.

The product of its digits is 112896, while the sum is 44.

The square root of 28719278 is about 5359.0370403646. The cubic root of 28719278 is about 306.2371252119.

The spelling of 28719278 in words is "twenty-eight million, seven hundred nineteen thousand, two hundred seventy-eight".