28388407 has 8 divisors (see below), whose sum is σ = 28828800. Its totient is φ = 27950520.

The previous prime is 28388401. The next prime is 28388411. The reversal of 28388407 is 70488382.

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 28388407 - 2¹⁹ = 27864119 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28388407.

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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47094 + ... + 47692.

It is an arithmetic number, because the mean of its divisors is an integer number (3603600).

Almost surely, 2^28388407 is an apocalyptic number.

28388407 is a deficient number, since it is larger than the sum of its proper divisors (440393).

28388407 is an equidigital number, since it uses as much as digits as its factorization.

28388407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1253.

The product of its (nonzero) digits is 86016, while the sum is 40.

The square root of 28388407 is about 5328.0772329237. The cubic root of 28388407 is about 305.0565406242.

The spelling of 28388407 in words is "twenty-eight million, three hundred eighty-eight thousand, four hundred seven".