28385013 has 16 divisors (see below), whose sum is σ = 39908736. Its totient is φ = 17909760.

The previous prime is 28385011. The next prime is 28385023. The reversal of 28385013 is 31058382.

It is a happy number.

It is not a de Polignac number, because 28385013 - 2¹ = 28385011 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28385011) 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, 4573 + ... + 8813.

It is an arithmetic number, because the mean of its divisors is an integer number (2494296).

Almost surely, 2^28385013 is an apocalyptic number.

28385013 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

28385013 is a deficient number, since it is larger than the sum of its proper divisors (11523723).

28385013 is a wasteful number, since it uses less digits than its factorization.

28385013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4364.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 28385013 is about 5327.7587220144. The cubic root of 28385013 is about 305.0443830422.

The spelling of 28385013 in words is "twenty-eight million, three hundred eighty-five thousand, thirteen".