28855868 has 12 divisors (see below), whose sum is σ = 53468352. Its totient is φ = 13579200.

The previous prime is 28855861. The next prime is 28855873. The reversal of 28855868 is 86855882.

It is a super-2 number, since 2×28855868² = 1665322236066848, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28855861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 212108 + ... + 212243.

It is an arithmetic number, because the mean of its divisors is an integer number (4455696).

Almost surely, 2^28855868 is an apocalyptic number.

It is an amenable number.

28855868 is a deficient number, since it is larger than the sum of its proper divisors (24612484).

28855868 is a wasteful number, since it uses less digits than its factorization.

28855868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424372 (or 424370 counting only the distinct ones).

The product of its digits is 1228800, while the sum is 50.

The square root of 28855868 is about 5371.7658176804. The cubic root of 28855868 is about 306.7218494479.

The spelling of 28855868 in words is "twenty-eight million, eight hundred fifty-five thousand, eight hundred sixty-eight".