28120442 has 16 divisors (see below), whose sum is σ = 48676992. Its totient is φ = 11934000.

The previous prime is 28120423. The next prime is 28120447. The reversal of 28120442 is 24402182.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (28120447) 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, 8309 + ... + 11192.

It is an arithmetic number, because the mean of its divisors is an integer number (3042312).

Almost surely, 2^28120442 is an apocalyptic number.

28120442 is a deficient number, since it is larger than the sum of its proper divisors (20556550).

28120442 is a wasteful number, since it uses less digits than its factorization.

28120442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19613.

The product of its (nonzero) digits is 1024, while the sum is 23.

The square root of 28120442 is about 5302.8711091257. The cubic root of 28120442 is about 304.0936706383.

The spelling of 28120442 in words is "twenty-eight million, one hundred twenty thousand, four hundred forty-two".