28218770 has 8 divisors (see below), whose sum is σ = 50793804. Its totient is φ = 11287504.

The previous prime is 28218767. The next prime is 28218787. The reversal of 28218770 is 7781282.

It can be written as a sum of positive squares in 2 ways, for example, as 27741289 + 477481 = 5267^2 + 691^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×28218770³ (a number of 23 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28218770.

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 3 ways as a sum of consecutive naturals, for example, 1410929 + ... + 1410948.

Almost surely, 2^28218770 is an apocalyptic number.

28218770 is a deficient number, since it is larger than the sum of its proper divisors (22575034).

28218770 is a wasteful number, since it uses less digits than its factorization.

28218770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2821884.

The product of its (nonzero) digits is 12544, while the sum is 35.

The square root of 28218770 is about 5312.1342227018. The cubic root of 28218770 is about 304.4476970643.

The spelling of 28218770 in words is "twenty-eight million, two hundred eighteen thousand, seven hundred seventy".