28730398 has 8 divisors (see below), whose sum is σ = 43160040. Its totient is φ = 14343720.

The previous prime is 28730371. The next prime is 28730417. The reversal of 28730398 is 89303782.

It is a happy number.

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 28730398.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 9013 + ... + 11776.

It is an arithmetic number, because the mean of its divisors is an integer number (5395005).

Almost surely, 2^28730398 is an apocalyptic number.

28730398 is a deficient number, since it is larger than the sum of its proper divisors (14429642).

28730398 is a wasteful number, since it uses less digits than its factorization.

28730398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21482.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 28730398 is about 5360.0744397816. The cubic root of 28730398 is about 306.2766447455.

The spelling of 28730398 in words is "twenty-eight million, seven hundred thirty thousand, three hundred ninety-eight".