28985440 has 96 divisors (see below), whose sum is σ = 76640256. Its totient is φ = 10268160.

The previous prime is 28985399. The next prime is 28985441. The reversal of 28985440 is 4458982.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 28985393 and 28985402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28985441) 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, 75489 + ... + 75871.

It is an arithmetic number, because the mean of its divisors is an integer number (798336).

Almost surely, 2^28985440 is an apocalyptic number.

28985440 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 28985440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38320128).

28985440 is an abundant number, since it is smaller than the sum of its proper divisors (47654816).

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

28985440 is a wasteful number, since it uses less digits than its factorization.

28985440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452 (or 444 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 40.

The square root of 28985440 is about 5383.8127753480. The cubic root of 28985440 is about 307.1802567968.

It can be divided in two parts, 2898 and 5440, that added together give a palindrome (8338).

The spelling of 28985440 in words is "twenty-eight million, nine hundred eighty-five thousand, four hundred forty".