28947888 has 80 divisors (see below), whose sum is σ = 83967840. Its totient is φ = 9547776.

The previous prime is 28947883. The next prime is 28947943. The reversal of 28947888 is 88874982.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (28947881) 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, 48520 + ... + 49112.

It is an arithmetic number, because the mean of its divisors is an integer number (1049598).

Almost surely, 2^28947888 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28947888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41983920).

28947888 is an abundant number, since it is smaller than the sum of its proper divisors (55019952).

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

28947888 is a wasteful number, since it uses less digits than its factorization.

28947888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 723 (or 711 counting only the distinct ones).

The product of its digits is 2064384, while the sum is 54.

The square root of 28947888 is about 5380.3241538034. The cubic root of 28947888 is about 307.0475439811.

The spelling of 28947888 in words is "twenty-eight million, nine hundred forty-seven thousand, eight hundred eighty-eight".