28722838 has 8 divisors (see below), whose sum is σ = 43155720. Its totient is φ = 14337600.

The previous prime is 28722817. The next prime is 28722853. The reversal of 28722838 is 83822782.

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 28722838.

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, 10363 + ... + 12838.

It is an arithmetic number, because the mean of its divisors is an integer number (5394465).

Almost surely, 2^28722838 is an apocalyptic number.

28722838 is a deficient number, since it is larger than the sum of its proper divisors (14432882).

28722838 is a wasteful number, since it uses less digits than its factorization.

28722838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23822.

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

The square root of 28722838 is about 5359.3691792971. The cubic root of 28722838 is about 306.2497782589.

The spelling of 28722838 in words is "twenty-eight million, seven hundred twenty-two thousand, eight hundred thirty-eight".