28385403 has 16 divisors (see below), whose sum is σ = 39290400. Its totient is φ = 18206720.

The previous prime is 28385387. The next prime is 28385417. The reversal of 28385403 is 30458382.

It is a cyclic number.

It is not a de Polignac number, because 28385403 - 2⁴ = 28385387 is a prime.

It is a super-4 number, since 4×28385403⁴ (a number of 31 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (28385003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43963 + ... + 44603.

It is an arithmetic number, because the mean of its divisors is an integer number (2455650).

Almost surely, 2^28385403 is an apocalyptic number.

28385403 is a deficient number, since it is larger than the sum of its proper divisors (10904997).

28385403 is a wasteful number, since it uses less digits than its factorization.

28385403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1182.

The product of its (nonzero) digits is 23040, while the sum is 33.

The square root of 28385403 is about 5327.7953226452. The cubic root of 28385403 is about 305.0457801029.

The spelling of 28385403 in words is "twenty-eight million, three hundred eighty-five thousand, four hundred three".