28481988 has 48 divisors (see below), whose sum is σ = 71305920. Its totient is φ = 8820864.

The previous prime is 28481977. The next prime is 28481993. The reversal of 28481988 is 88918482.

It is a super-2 number, since 2×28481988² = 1622447280864288, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10906 + ... + 13262.

It is an arithmetic number, because the mean of its divisors is an integer number (1485540).

Almost surely, 2^28481988 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 28481988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35652960).

28481988 is an abundant number, since it is smaller than the sum of its proper divisors (42823932).

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

28481988 is a wasteful number, since it uses less digits than its factorization.

28481988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2436 (or 2434 counting only the distinct ones).

The product of its digits is 294912, while the sum is 48.

The square root of 28481988 is about 5336.8518810250. The cubic root of 28481988 is about 305.3913743115.

The spelling of 28481988 in words is "twenty-eight million, four hundred eighty-one thousand, nine hundred eighty-eight".