28421442 has 80 divisors (see below), whose sum is σ = 74017152. Its totient is φ = 7983360.

The previous prime is 28421413. The next prime is 28421443. The reversal of 28421442 is 24412482.

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 (28421443) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 80338 + ... + 80690.

Almost surely, 2^28421442 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28421442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37008576).

28421442 is an abundant number, since it is smaller than the sum of its proper divisors (45595710).

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

28421442 is a wasteful number, since it uses less digits than its factorization.

28421442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445 (or 436 counting only the distinct ones).

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

The square root of 28421442 is about 5331.1764180151. The cubic root of 28421442 is about 305.1748240763.

The spelling of 28421442 in words is "twenty-eight million, four hundred twenty-one thousand, four hundred forty-two".