28199581440 has 144 divisors (see below), whose sum is σ = 93168381600. Its totient is φ = 7260553216.

The previous prime is 28199581387. The next prime is 28199581447. The reversal of 28199581440 is 4418599182.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28199581447) 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, 15255 + ... + 237974.

It is an arithmetic number, because the mean of its divisors is an integer number (647002650).

Almost surely, 2^28199581440 is an apocalyptic number.

28199581440 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 28199581440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46584190800).

28199581440 is an abundant number, since it is smaller than the sum of its proper divisors (64968800160).

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

28199581440 is a wasteful number, since it uses less digits than its factorization.

28199581440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253282 (or 253268 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 51.

The spelling of 28199581440 in words is "twenty-eight billion, one hundred ninety-nine million, five hundred eighty-one thousand, four hundred forty".