28140752640 has 576 divisors, whose sum is σ = 120687178752. Its totient is φ = 5396889600.

The previous prime is 28140752623. The next prime is 28140752663. The reversal of 28140752640 is 4625704182.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3840180 + ... + 3847500.

It is an arithmetic number, because the mean of its divisors is an integer number (209526352).

Almost surely, 2^28140752640 is an apocalyptic number.

28140752640 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 28140752640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60343589376).

28140752640 is an abundant number, since it is smaller than the sum of its proper divisors (92546426112).

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

28140752640 is a wasteful number, since it uses less digits than its factorization.

28140752640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7376 (or 7362 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 39.

The spelling of 28140752640 in words is "twenty-eight billion, one hundred forty million, seven hundred fifty-two thousand, six hundred forty".