28989560 has 64 divisors (see below), whose sum is σ = 68666400. Its totient is φ = 10999296.

The previous prime is 28989551. The next prime is 28989563. The reversal of 28989560 is 6598982.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28989563) 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 15 ways as a sum of consecutive naturals, for example, 77534 + ... + 77906.

Almost surely, 2^28989560 is an apocalyptic number.

28989560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28989560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34333200).

28989560 is an abundant number, since it is smaller than the sum of its proper divisors (39676840).

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

28989560 is a wasteful number, since it uses less digits than its factorization.

28989560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480 (or 476 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 47.

The square root of 28989560 is about 5384.1953902138. The cubic root of 28989560 is about 307.1948103417.

The spelling of 28989560 in words is "twenty-eight million, nine hundred eighty-nine thousand, five hundred sixty".