28193615720 has 32 divisors (see below), whose sum is σ = 63542662920. Its totient is φ = 11258419200.

The previous prime is 28193615617. The next prime is 28193615741. The reversal of 28193615720 is 2751639182.

It can be written as a sum of positive squares in 4 ways, for example, as 27563304484 + 630311236 = 166022^2 + 25106^2 .

It is a super-2 number, since 2×28193615720² (a number of 22 digits) contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 570581 + ... + 618020.

Almost surely, 2^28193615720 is an apocalyptic number.

28193615720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28193615720 is an abundant number, since it is smaller than the sum of its proper divisors (35349047200).

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

28193615720 is a wasteful number, since it uses less digits than its factorization.

28193615720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1189205 (or 1189201 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 44.

The spelling of 28193615720 in words is "twenty-eight billion, one hundred ninety-three million, six hundred fifteen thousand, seven hundred twenty".