28470042 has 80 divisors (see below), whose sum is σ = 67337952. Its totient is φ = 8981280.

The previous prime is 28470041. The next prime is 28470049. The reversal of 28470042 is 24007482.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 28469988 and 28470015.

It is not an unprimeable number, because it can be changed into a prime (28470041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 424893 + ... + 424959.

Almost surely, 2^28470042 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28470042, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33668976).

28470042 is an abundant number, since it is smaller than the sum of its proper divisors (38867910).

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

28470042 is a wasteful number, since it uses less digits than its factorization.

28470042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185 (or 176 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 27.

The square root of 28470042 is about 5335.7325645126. The cubic root of 28470042 is about 305.3486722884.

The spelling of 28470042 in words is "twenty-eight million, four hundred seventy thousand, forty-two".