28785403 has 8 divisors (see below), whose sum is σ = 31222800. Its totient is φ = 26430720.

The previous prime is 28785401. The next prime is 28785409. The reversal of 28785403 is 30458782.

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

It is a cyclic number.

It is not a de Polignac number, because 28785403 - 2¹ = 28785401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28785401) 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, 19953 + ... + 21346.

It is an arithmetic number, because the mean of its divisors is an integer number (3902850).

Almost surely, 2^28785403 is an apocalyptic number.

28785403 is a deficient number, since it is larger than the sum of its proper divisors (2437397).

28785403 is a wasteful number, since it uses less digits than its factorization.

28785403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41357.

The product of its (nonzero) digits is 53760, while the sum is 37.

The square root of 28785403 is about 5365.2029784529. The cubic root of 28785403 is about 306.4719780078.

It can be divided in two parts, 2878 and 5403, that added together give a square (8281 = 91²).

The spelling of 28785403 in words is "twenty-eight million, seven hundred eighty-five thousand, four hundred three".