28222646 has 4 divisors (see below), whose sum is σ = 42333972. Its totient is φ = 14111322.

The previous prime is 28222631. The next prime is 28222681. The reversal of 28222646 is 64622282.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7055660 + ... + 7055663.

It is an arithmetic number, because the mean of its divisors is an integer number (10583493).

Almost surely, 2^28222646 is an apocalyptic number.

28222646 is a deficient number, since it is larger than the sum of its proper divisors (14111326).

28222646 is a wasteful number, since it uses less digits than its factorization.

28222646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14111325.

The product of its digits is 18432, while the sum is 32.

The square root of 28222646 is about 5312.4990352940. The cubic root of 28222646 is about 304.4616356029.

The spelling of 28222646 in words is "twenty-eight million, two hundred twenty-two thousand, six hundred forty-six".