28388406 has 16 divisors (see below), whose sum is σ = 57127104. Its totient is φ = 9404424.

The previous prime is 28388401. The next prime is 28388411. The reversal of 28388406 is 60488382.

It is an interprime number because it is at equal distance from previous prime (28388401) and next prime (28388411).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28388401) 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, 13536 + ... + 15491.

It is an arithmetic number, because the mean of its divisors is an integer number (3570444).

Almost surely, 2^28388406 is an apocalyptic number.

28388406 is an abundant number, since it is smaller than the sum of its proper divisors (28738698).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28388406 is a wasteful number, since it uses less digits than its factorization.

28388406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29195.

The product of its (nonzero) digits is 73728, while the sum is 39.

The square root of 28388406 is about 5328.0771390812. The cubic root of 28388406 is about 305.0565370423.

The spelling of 28388406 in words is "twenty-eight million, three hundred eighty-eight thousand, four hundred six".