28036697640 has 256 divisors, whose sum is σ = 97758904320. Its totient is φ = 6300426240.

The previous prime is 28036697621. The next prime is 28036697641. The reversal of 28036697640 is 4679663082.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (28036697641) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 13280185 + ... + 13282295.

It is an arithmetic number, because the mean of its divisors is an integer number (381870720).

Almost surely, 2^28036697640 is an apocalyptic number.

28036697640 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 28036697640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48879452160).

28036697640 is an abundant number, since it is smaller than the sum of its proper divisors (69722206680).

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

28036697640 is a wasteful number, since it uses less digits than its factorization.

28036697640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2392 (or 2388 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 51.

The spelling of 28036697640 in words is "twenty-eight billion, thirty-six million, six hundred ninety-seven thousand, six hundred forty".