28889868 has 48 divisors (see below), whose sum is σ = 81575424. Its totient is φ = 7768320.

The previous prime is 28889857. The next prime is 28889869. The reversal of 28889868 is 86898882.

It is not an unprimeable number, because it can be changed into a prime (28889869) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8688 + ... + 11543.

It is an arithmetic number, because the mean of its divisors is an integer number (1699488).

Almost surely, 2^28889868 is an apocalyptic number.

28889868 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28889868 is an abundant number, since it is smaller than the sum of its proper divisors (52685556).

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

28889868 is a wasteful number, since it uses less digits than its factorization.

28889868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20262 (or 20260 counting only the distinct ones).

The product of its digits is 3538944, while the sum is 57.

The square root of 28889868 is about 5374.9295809341. The cubic root of 28889868 is about 306.8422692031.

The spelling of 28889868 in words is "twenty-eight million, eight hundred eighty-nine thousand, eight hundred sixty-eight".