28124442 has 32 divisors (see below), whose sum is σ = 64028160. Its totient is φ = 9145440.

The previous prime is 28124441. The next prime is 28124479. The reversal of 28124442 is 24442182.

It is a super-2 number, since 2×28124442² = 1581968475622728, which contains 22 as substring.

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 (28124441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4138 + ... + 8565.

It is an arithmetic number, because the mean of its divisors is an integer number (2000880).

Almost surely, 2^28124442 is an apocalyptic number.

28124442 is an abundant number, since it is smaller than the sum of its proper divisors (35903718).

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

28124442 is a wasteful number, since it uses less digits than its factorization.

28124442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12755 (or 12749 counting only the distinct ones).

The product of its digits is 4096, while the sum is 27.

The square root of 28124442 is about 5303.2482498936. The cubic root of 28124442 is about 304.1080885839.

The spelling of 28124442 in words is "twenty-eight million, one hundred twenty-four thousand, four hundred forty-two".