28889928 has 48 divisors (see below), whose sum is σ = 78558480. Its totient is φ = 9591264.

The previous prime is 28889921. The next prime is 28889951. The reversal of 28889928 is 82998882.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (28889921) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21451 + ... + 22757.

It is an arithmetic number, because the mean of its divisors is an integer number (1636635).

Almost surely, 2^28889928 is an apocalyptic number.

It is an amenable number.

28889928 is an abundant number, since it is smaller than the sum of its proper divisors (49668552).

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

28889928 is a wasteful number, since it uses less digits than its factorization.

28889928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1626 (or 1619 counting only the distinct ones).

The product of its digits is 1327104, while the sum is 54.

The square root of 28889928 is about 5374.9351623996. The cubic root of 28889928 is about 306.8424816250.

The spelling of 28889928 in words is "twenty-eight million, eight hundred eighty-nine thousand, nine hundred twenty-eight".