28749818 has 4 divisors (see below), whose sum is σ = 43124730. Its totient is φ = 14374908.

The previous prime is 28749811. The next prime is 28749827. The reversal of 28749818 is 81894782.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 27952369 + 797449 = 5287^2 + 893^2 .

It is not an unprimeable number, because it can be changed into a prime (28749811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7187453 + ... + 7187456.

Almost surely, 2^28749818 is an apocalyptic number.

28749818 is a deficient number, since it is larger than the sum of its proper divisors (14374912).

28749818 is a wasteful number, since it uses less digits than its factorization.

28749818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14374911.

The product of its digits is 258048, while the sum is 47.

The square root of 28749818 is about 5361.8856757674. The cubic root of 28749818 is about 306.3456373250.

It can be divided in two parts, 287 and 49818, that added together give a palindrome (50105).

The spelling of 28749818 in words is "twenty-eight million, seven hundred forty-nine thousand, eight hundred eighteen".