28122372 has 36 divisors (see below), whose sum is σ = 71658496. Its totient is φ = 9298800.

The previous prime is 28122323. The next prime is 28122389. The reversal of 28122372 is 27322182.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1497 + ... + 7647.

Almost surely, 2^28122372 is an apocalyptic number.

It is an amenable number.

28122372 is an abundant number, since it is smaller than the sum of its proper divisors (43536124).

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

28122372 is a wasteful number, since it uses less digits than its factorization.

28122372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6288 (or 6283 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 28122372 is about 5303.0530828948. The cubic root of 28122372 is about 304.1006274677.

It can be divided in two parts, 2812 and 2372, that added together give a square (5184 = 72²).

The spelling of 28122372 in words is "twenty-eight million, one hundred twenty-two thousand, three hundred seventy-two".