28286403 has 8 divisors (see below), whose sum is σ = 37740288. Its totient is φ = 18845064.

The previous prime is 28286393. The next prime is 28286407. The reversal of 28286403 is 30468282.

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

It is not a de Polignac number, because 28286403 - 2¹² = 28282307 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28286407) 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, 5626 + ... + 9392.

It is an arithmetic number, because the mean of its divisors is an integer number (4717536).

Almost surely, 2^28286403 is an apocalyptic number.

28286403 is a deficient number, since it is larger than the sum of its proper divisors (9453885).

28286403 is a wasteful number, since it uses less digits than its factorization.

28286403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6273.

The product of its (nonzero) digits is 18432, while the sum is 33.

The square root of 28286403 is about 5318.4963100485. The cubic root of 28286403 is about 304.6907301328.

The spelling of 28286403 in words is "twenty-eight million, two hundred eighty-six thousand, four hundred three".