28518633840972 has 96 divisors (see below), whose sum is σ = 73520737000704. Its totient is φ = 8531702726400.

The previous prime is 28518633840937. The next prime is 28518633840979. The reversal of 28518633840972 is 27904833681582.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is not an unprimeable number, because it can be changed into a prime (28518633840979) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14187798 + ... + 16072674.

It is an arithmetic number, because the mean of its divisors is an integer number (765841010424).

It is a 2-persistent number, because it is pandigital, and so is 2⋅28518633840972 = 57037267681944, but 3⋅28518633840972 = 85555901522916 is not.

Almost surely, 2^{28518633840972} is an apocalyptic number.

28518633840972 is a gapful number since it is divisible by the number (22) 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 28518633840972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36760368500352).

28518633840972 is an abundant number, since it is smaller than the sum of its proper divisors (45002103159732).

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

28518633840972 is a wasteful number, since it uses less digits than its factorization.

28518633840972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1886359 (or 1886357 counting only the distinct ones).

The product of its (nonzero) digits is 139345920, while the sum is 66.

The spelling of 28518633840972 in words is "twenty-eight trillion, five hundred eighteen billion, six hundred thirty-three million, eight hundred forty thousand, nine hundred seventy-two".