28687818 has 16 divisors (see below), whose sum is σ = 57678336. Its totient is φ = 9512160.

The previous prime is 28687817. The next prime is 28687843. The reversal of 28687818 is 81878682.

It is a super-2 number, since 2×28687818² = 1645981803202248, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28687811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11371 + ... + 13662.

It is an arithmetic number, because the mean of its divisors is an integer number (3604896).

Almost surely, 2^28687818 is an apocalyptic number.

28687818 is an abundant number, since it is smaller than the sum of its proper divisors (28990518).

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

28687818 is a wasteful number, since it uses less digits than its factorization.

28687818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25229.

The product of its digits is 344064, while the sum is 48.

The square root of 28687818 is about 5356.1010072627. The cubic root of 28687818 is about 306.1252637650.

The spelling of 28687818 in words is "twenty-eight million, six hundred eighty-seven thousand, eight hundred eighteen".