28820242 has 16 divisors (see below), whose sum is σ = 49211712. Its totient is φ = 12530320.

The previous prime is 28820221. The next prime is 28820263. The reversal of 28820242 is 24202882.

It is an interprime number because it is at equal distance from previous prime (28820221) and next prime (28820263).

It is a self number, because there is not a number n which added to its sum of digits gives 28820242.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 27973 + ... + 28984.

It is an arithmetic number, because the mean of its divisors is an integer number (3075732).

Almost surely, 2^28820242 is an apocalyptic number.

28820242 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

28820242 is a deficient number, since it is larger than the sum of its proper divisors (20391470).

28820242 is a wasteful number, since it uses less digits than its factorization.

28820242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56993.

The product of its (nonzero) digits is 4096, while the sum is 28.

The square root of 28820242 is about 5368.4487517345. The cubic root of 28820242 is about 306.5955692669.

The spelling of 28820242 in words is "twenty-eight million, eight hundred twenty thousand, two hundred forty-two".