28881888 has 48 divisors (see below), whose sum is σ = 86647680. Its totient is φ = 8251776.

The previous prime is 28881887. The next prime is 28881899. The reversal of 28881888 is 88818882.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

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

It is a self number, because there is not a number n which added to its sum of digits gives 28881888.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28881887) 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 7 ways as a sum of consecutive naturals, for example, 20818 + ... + 22161.

It is an arithmetic number, because the mean of its divisors is an integer number (1805160).

Almost surely, 2^28881888 is an apocalyptic number.

28881888 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28881888 is an abundant number, since it is smaller than the sum of its proper divisors (57765792).

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

28881888 is a wasteful number, since it uses less digits than its factorization.

28881888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42999 (or 42991 counting only the distinct ones).

The product of its digits is 524288, while the sum is 51.

The square root of 28881888 is about 5374.1871943579. The cubic root of 28881888 is about 306.8140144669.

The spelling of 28881888 in words is "twenty-eight million, eight hundred eighty-one thousand, eight hundred eighty-eight".