28218270 has 32 divisors (see below), whose sum is σ = 68429088. Its totient is φ = 7446528.

The previous prime is 28218269. The next prime is 28218293. The reversal of 28218270 is 7281282.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1939 + ... + 7758.

It is an arithmetic number, because the mean of its divisors is an integer number (2138409).

Almost surely, 2^28218270 is an apocalyptic number.

28218270 is an abundant number, since it is smaller than the sum of its proper divisors (40210818).

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

28218270 is a wasteful number, since it uses less digits than its factorization.

28218270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9804.

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 28218270 is about 5312.0871604295. The cubic root of 28218270 is about 304.4458989142.

The spelling of 28218270 in words is "twenty-eight million, two hundred eighteen thousand, two hundred seventy".