28636618648 has 64 divisors (see below), whose sum is σ = 61682860800. Its totient is φ = 12336382080.

The previous prime is 28636618573. The next prime is 28636618649. The reversal of 28636618648 is 84681663682.

It is a junction number, because it is equal to n+sod(n) for n = 28636618592 and 28636618601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28636618649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 155715 + ... + 285517.

It is an arithmetic number, because the mean of its divisors is an integer number (963794700).

Almost surely, 2^28636618648 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28636618648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30841430400).

28636618648 is an abundant number, since it is smaller than the sum of its proper divisors (33046242152).

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

28636618648 is a wasteful number, since it uses less digits than its factorization.

28636618648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129952 (or 129948 counting only the distinct ones).

The product of its digits is 15925248, while the sum is 58.

The spelling of 28636618648 in words is "twenty-eight billion, six hundred thirty-six million, six hundred eighteen thousand, six hundred forty-eight".