28039122 has 20 divisors (see below), whose sum is σ = 62828766. Its totient is φ = 9346320.

The previous prime is 28039091. The next prime is 28039127. The reversal of 28039122 is 22193082.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 14356521 + 13682601 = 3789^2 + 3699^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (28039127) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 86379 + ... + 86702.

Almost surely, 2^28039122 is an apocalyptic number.

28039122 is an abundant number, since it is smaller than the sum of its proper divisors (34789644).

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

28039122 is a wasteful number, since it uses less digits than its factorization.

28039122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173095 (or 173086 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 28039122 is about 5295.1980132947. The cubic root of 28039122 is about 303.8002568878.

The spelling of 28039122 in words is "twenty-eight million, thirty-nine thousand, one hundred twenty-two".