28775822 has 4 divisors (see below), whose sum is σ = 43163736. Its totient is φ = 14387910.

The previous prime is 28775821. The next prime is 28775827. The reversal of 28775822 is 22857782.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 28775822.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28775821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7193954 + ... + 7193957.

It is an arithmetic number, because the mean of its divisors is an integer number (10790934).

Almost surely, 2^28775822 is an apocalyptic number.

28775822 is a deficient number, since it is larger than the sum of its proper divisors (14387914).

28775822 is a wasteful number, since it uses less digits than its factorization.

28775822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14387913.

The product of its digits is 125440, while the sum is 41.

The square root of 28775822 is about 5364.3100208694. The cubic root of 28775822 is about 306.4379719543.

The spelling of 28775822 in words is "twenty-eight million, seven hundred seventy-five thousand, eight hundred twenty-two".