28022292 has 18 divisors (see below), whose sum is σ = 70834218. Its totient is φ = 9340752.

The previous prime is 28022287. The next prime is 28022297. The reversal of 28022292 is 29222082.

It is an interprime number because it is at equal distance from previous prime (28022287) and next prime (28022297).

It can be written as a sum of positive squares in only one way, i.e., 19236996 + 8785296 = 4386^2 + 2964^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28022297) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 389163 + ... + 389234.

Almost surely, 2^28022292 is an apocalyptic number.

It is an amenable number.

28022292 is an abundant number, since it is smaller than the sum of its proper divisors (42811926).

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

28022292 is a wasteful number, since it uses less digits than its factorization.

28022292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 778407 (or 778402 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 28022292 is about 5293.6085990560. The cubic root of 28022292 is about 303.7394610986.

The spelling of 28022292 in words is "twenty-eight million, twenty-two thousand, two hundred ninety-two".