28748868 has 12 divisors (see below), whose sum is σ = 67080720. Its totient is φ = 9582952.

The previous prime is 28748861. The next prime is 28748879. The reversal of 28748868 is 86884782.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×28748868² = 1652994822562848, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28748868.

It is not an unprimeable number, because it can be changed into a prime (28748861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1197858 + ... + 1197881.

It is an arithmetic number, because the mean of its divisors is an integer number (5590060).

Almost surely, 2^28748868 is an apocalyptic number.

It is an amenable number.

28748868 is an abundant number, since it is smaller than the sum of its proper divisors (38331852).

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

28748868 is a wasteful number, since it uses less digits than its factorization.

28748868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2395746 (or 2395744 counting only the distinct ones).

The product of its digits is 1376256, while the sum is 51.

The square root of 28748868 is about 5361.7970867984. The cubic root of 28748868 is about 306.3422630247.

The spelling of 28748868 in words is "twenty-eight million, seven hundred forty-eight thousand, eight hundred sixty-eight".