28087122 has 16 divisors (see below), whose sum is σ = 64199232. Its totient is φ = 8024880.

The previous prime is 28087121. The next prime is 28087133. The reversal of 28087122 is 22178082.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 28087122.

It is not an unprimeable number, because it can be changed into a prime (28087121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 334329 + ... + 334412.

It is an arithmetic number, because the mean of its divisors is an integer number (4012452).

Almost surely, 2^28087122 is an apocalyptic number.

28087122 is an abundant number, since it is smaller than the sum of its proper divisors (36112110).

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

28087122 is a wasteful number, since it uses less digits than its factorization.

28087122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 668753.

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 28087122 is about 5299.7284836112. The cubic root of 28087122 is about 303.9735159869.

The spelling of 28087122 in words is "twenty-eight million, eighty-seven thousand, one hundred twenty-two".