28422012 has 12 divisors (see below), whose sum is σ = 66318056. Its totient is φ = 9474000.

The previous prime is 28421999. The next prime is 28422013. The reversal of 28422012 is 21022482.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×28422012² = 1615621532256288, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28422012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28422013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1184239 + ... + 1184262.

Almost surely, 2^28422012 is an apocalyptic number.

It is an amenable number.

28422012 is an abundant number, since it is smaller than the sum of its proper divisors (37896044).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28422012 is a wasteful number, since it uses less digits than its factorization.

28422012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2368508 (or 2368506 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 28422012 is about 5331.2298768671. The cubic root of 28422012 is about 305.1768641849.

Adding to 28422012 its reverse (21022482), we get a palindrome (49444494).

The spelling of 28422012 in words is "twenty-eight million, four hundred twenty-two thousand, twelve".