28136222064 has 120 divisors (see below), whose sum is σ = 79288367184. Its totient is φ = 9313920000.

The previous prime is 28136222063. The next prime is 28136222083. The reversal of 28136222064 is 46022263182.

28136222064 is a `hidden beast` number, since 2 + 8 + 1 + 3 + 622 + 20 + 6 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28136222063) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21298524 + ... + 21299844.

Almost surely, 2^28136222064 is an apocalyptic number.

28136222064 is a gapful number since it is divisible by the number (24) 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 28136222064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39644183592).

28136222064 is an abundant number, since it is smaller than the sum of its proper divisors (51152145120).

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

28136222064 is a wasteful number, since it uses less digits than its factorization.

28136222064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2247 (or 2238 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 36.

The spelling of 28136222064 in words is "twenty-eight billion, one hundred thirty-six million, two hundred twenty-two thousand, sixty-four".