28660242 has 32 divisors (see below), whose sum is σ = 62314560. Its totient is φ = 8735040.

The previous prime is 28660241. The next prime is 28660243. The reversal of 28660242 is 24206682.

It is an interprime number because it is at equal distance from previous prime (28660241) and next prime (28660243).

It is not an unprimeable number, because it can be changed into a prime (28660241) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 6817 + ... + 10187.

It is an arithmetic number, because the mean of its divisors is an integer number (1947330).

Almost surely, 2^28660242 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28660242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31157280).

28660242 is an abundant number, since it is smaller than the sum of its proper divisors (33654318).

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

28660242 is a wasteful number, since it uses less digits than its factorization.

28660242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3498.

The product of its (nonzero) digits is 9216, while the sum is 30.

The square root of 28660242 is about 5353.5261277031. The cubic root of 28660242 is about 306.0271452701.

The spelling of 28660242 in words is "twenty-eight million, six hundred sixty thousand, two hundred forty-two".