28121201064 has 48 divisors (see below), whose sum is σ = 83085369120. Its totient is φ = 8521575840.

The previous prime is 28121201051. The next prime is 28121201077. The reversal of 28121201064 is 46010212182.

It is an interprime number because it is at equal distance from previous prime (28121201051) and next prime (28121201077).

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 17752492 + ... + 17754075.

It is an arithmetic number, because the mean of its divisors is an integer number (1730945190).

Almost surely, 2^28121201064 is an apocalyptic number.

28121201064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28121201064 is an abundant number, since it is smaller than the sum of its proper divisors (54964168056).

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

28121201064 is a wasteful number, since it uses less digits than its factorization.

28121201064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35506590 (or 35506583 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The spelling of 28121201064 in words is "twenty-eight billion, one hundred twenty-one million, two hundred one thousand, sixty-four".