28631222 has 4 divisors (see below), whose sum is σ = 42946836. Its totient is φ = 14315610.

The previous prime is 28631221. The next prime is 28631237. The reversal of 28631222 is 22213682.

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

It is a junction number, because it is equal to n+sod(n) for n = 28631191 and 28631200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28631221) 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 as a sum of consecutive naturals, namely, 7157804 + ... + 7157807.

It is an arithmetic number, because the mean of its divisors is an integer number (10736709).

Almost surely, 2^28631222 is an apocalyptic number.

28631222 is a deficient number, since it is larger than the sum of its proper divisors (14315614).

28631222 is a wasteful number, since it uses less digits than its factorization.

28631222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14315613.

The product of its digits is 2304, while the sum is 26.

The square root of 28631222 is about 5350.8150780979. The cubic root of 28631222 is about 305.9238208704.

The spelling of 28631222 in words is "twenty-eight million, six hundred thirty-one thousand, two hundred twenty-two".