28406398 has 8 divisors (see below), whose sum is σ = 42633720. Its totient is φ = 14195160.

The previous prime is 28406393. The next prime is 28406401. The reversal of 28406398 is 89360482.

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

It is a self number, because there is not a number n which added to its sum of digits gives 28406398.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28406393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2533 + ... + 7951.

It is an arithmetic number, because the mean of its divisors is an integer number (5329215).

Almost surely, 2^28406398 is an apocalyptic number.

28406398 is a deficient number, since it is larger than the sum of its proper divisors (14227322).

28406398 is a wasteful number, since it uses less digits than its factorization.

28406398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8042.

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 28406398 is about 5329.7652856388. The cubic root of 28406398 is about 305.1209696620.

The spelling of 28406398 in words is "twenty-eight million, four hundred six thousand, three hundred ninety-eight".