28998840 has 128 divisors (see below), whose sum is σ = 97070400. Its totient is φ = 6881280.

The previous prime is 28998839. The next prime is 28998847. The reversal of 28998840 is 4889982.

It is a self number, because there is not a number n which added to its sum of digits gives 28998840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28998847) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44920 + ... + 45560.

Almost surely, 2^28998840 is an apocalyptic number.

28998840 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 28998840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48535200).

28998840 is an abundant number, since it is smaller than the sum of its proper divisors (68071560).

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

28998840 is a wasteful number, since it uses less digits than its factorization.

28998840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 697 (or 693 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 48.

The square root of 28998840 is about 5385.0571027613. The cubic root of 28998840 is about 307.2275860915.

The spelling of 28998840 in words is "twenty-eight million, nine hundred ninety-eight thousand, eight hundred forty".