28636217280 has 448 divisors, whose sum is σ = 110640936960. Its totient is φ = 6914764800.

The previous prime is 28636217231. The next prime is 28636217317. The reversal of 28636217280 is 8271263682.

28636217280 is a `hidden beast` number, since 2 + 8 + 6 + 362 + 1 + 7 + 280 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 34879270 + ... + 34880090.

Almost surely, 2^28636217280 is an apocalyptic number.

28636217280 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 28636217280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55320468480).

28636217280 is an abundant number, since it is smaller than the sum of its proper divisors (82004719680).

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

28636217280 is a wasteful number, since it uses less digits than its factorization.

28636217280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1225 (or 1209 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The spelling of 28636217280 in words is "twenty-eight billion, six hundred thirty-six million, two hundred seventeen thousand, two hundred eighty".