28127297620 has 24 divisors (see below), whose sum is σ = 59070549384. Its totient is φ = 11250304896.

The previous prime is 28127297617. The next prime is 28127297629. The reversal of 28127297620 is 2679272182.

It can be written as a sum of positive squares in 4 ways, for example, as 713210436 + 27414087184 = 26706^2 + 165572^2 .

It is a super-2 number, since 2×28127297620² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28127297629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 580654 + ... + 627226.

It is an arithmetic number, because the mean of its divisors is an integer number (2461272891).

Almost surely, 2^28127297620 is an apocalyptic number.

28127297620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28127297620 is an abundant number, since it is smaller than the sum of its proper divisors (30943251764).

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

28127297620 is a wasteful number, since it uses less digits than its factorization.

28127297620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76779 (or 76777 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 46.

The spelling of 28127297620 in words is "twenty-eight billion, one hundred twenty-seven million, two hundred ninety-seven thousand, six hundred twenty".