28040013600 has 144 divisors (see below), whose sum is σ = 91324029888. Its totient is φ = 7472931840.

The previous prime is 28040013583. The next prime is 28040013623. The reversal of 28040013600 is 631004082.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7286877 + ... + 7290723.

It is an arithmetic number, because the mean of its divisors is an integer number (634194652).

Almost surely, 2^28040013600 is an apocalyptic number.

28040013600 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 28040013600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45662014944).

28040013600 is an abundant number, since it is smaller than the sum of its proper divisors (63284016288).

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

28040013600 is a wasteful number, since it uses less digits than its factorization.

28040013600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6907 (or 6894 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 28040013600 its reverse (631004082), we get a palindrome (28671017682).

The spelling of 28040013600 in words is "twenty-eight billion, forty million, thirteen thousand, six hundred".