28997488 has 40 divisors (see below), whose sum is σ = 61107200. Its totient is φ = 13250304.

The previous prime is 28997483. The next prime is 28997491. The reversal of 28997488 is 88479982.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28997483) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22033 + ... + 23311.

It is an arithmetic number, because the mean of its divisors is an integer number (1527680).

Almost surely, 2^28997488 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 28997488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30553600).

28997488 is an abundant number, since it is smaller than the sum of its proper divisors (32109712).

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

28997488 is a wasteful number, since it uses less digits than its factorization.

28997488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1409 (or 1403 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 55.

The square root of 28997488 is about 5384.9315687388. The cubic root of 28997488 is about 307.2228114390. Note that the first 3 decimals are identical.

The spelling of 28997488 in words is "twenty-eight million, nine hundred ninety-seven thousand, four hundred eighty-eight".