28404981500 has 144 divisors (see below), whose sum is σ = 72320058720. Its totient is φ = 9717926400.

The previous prime is 28404981499. The next prime is 28404981503. The reversal of 28404981500 is 518940482.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28404981503) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15164564 + ... + 15166436.

It is an arithmetic number, because the mean of its divisors is an integer number (502222630).

Almost surely, 2^28404981500 is an apocalyptic number.

28404981500 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 28404981500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36160029360).

28404981500 is an abundant number, since it is smaller than the sum of its proper divisors (43915077220).

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

28404981500 is a wasteful number, since it uses less digits than its factorization.

28404981500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2525 (or 2506 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 41.

The spelling of 28404981500 in words is "twenty-eight billion, four hundred four million, nine hundred eighty-one thousand, five hundred".