28278475 has 6 divisors (see below), whose sum is σ = 35065340. Its totient is φ = 22622760.

The previous prime is 28278461. The next prime is 28278487. The reversal of 28278475 is 57487282.

It is not a de Polignac number, because 28278475 - 2⁷ = 28278347 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 565545 + ... + 565594.

Almost surely, 2^28278475 is an apocalyptic number.

28278475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28278475 is a deficient number, since it is larger than the sum of its proper divisors (6786865).

28278475 is a wasteful number, since it uses less digits than its factorization.

28278475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1131149 (or 1131144 counting only the distinct ones).

The product of its digits is 250880, while the sum is 43.

The square root of 28278475 is about 5317.7509343707. The cubic root of 28278475 is about 304.6622616395.

The spelling of 28278475 in words is "twenty-eight million, two hundred seventy-eight thousand, four hundred seventy-five".