28147818 has 32 divisors (see below), whose sum is σ = 60008256. Its totient is φ = 8771328.

The previous prime is 28147813. The next prime is 28147831. The reversal of 28147818 is 81874182.

It is a happy number.

It is a super-2 number, since 2×28147818² = 1584599316322248, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28147813) 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, 15780 + ... + 17472.

It is an arithmetic number, because the mean of its divisors is an integer number (1875258).

Almost surely, 2^28147818 is an apocalyptic number.

28147818 is an abundant number, since it is smaller than the sum of its proper divisors (31860438).

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

28147818 is a wasteful number, since it uses less digits than its factorization.

28147818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1878.

The product of its digits is 28672, while the sum is 39.

The square root of 28147818 is about 5305.4517244058. The cubic root of 28147818 is about 304.1923197313.

The spelling of 28147818 in words is "twenty-eight million, one hundred forty-seven thousand, eight hundred eighteen".