28687868 has 12 divisors (see below), whose sum is σ = 54767832. Its totient is φ = 13039920.

The previous prime is 28687861. The next prime is 28687889. The reversal of 28687868 is 86878682.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28687861) 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, 325955 + ... + 326042.

It is an arithmetic number, because the mean of its divisors is an integer number (4563986).

Almost surely, 2^28687868 is an apocalyptic number.

It is an amenable number.

28687868 is a deficient number, since it is larger than the sum of its proper divisors (26079964).

28687868 is a wasteful number, since it uses less digits than its factorization.

28687868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652012 (or 652010 counting only the distinct ones).

The product of its digits is 2064384, while the sum is 53.

The square root of 28687868 is about 5356.1056748350. The cubic root of 28687868 is about 306.1254416134.

The spelling of 28687868 in words is "twenty-eight million, six hundred eighty-seven thousand, eight hundred sixty-eight".