28666505593940 has 12 divisors (see below), whose sum is σ = 60199661747316. Its totient is φ = 11466602237568.

The previous prime is 28666505593937. The next prime is 28666505594009. The reversal of 28666505593940 is 4939550566682.

It can be written as a sum of positive squares in 2 ways, for example, as 7396681059856 + 21269824534084 = 2719684^2 + 4611922^2 .

It is a hoax number, since the sum of its digits (68) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 716662639829 + ... + 716662639868.

It is an arithmetic number, because the mean of its divisors is an integer number (5016638478943).

Almost surely, 2^{28666505593940} is an apocalyptic number.

28666505593940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28666505593940 is an abundant number, since it is smaller than the sum of its proper divisors (31533156153376).

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

28666505593940 is a wasteful number, since it uses less digits than its factorization.

28666505593940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1433325279706 (or 1433325279704 counting only the distinct ones).

The product of its (nonzero) digits is 419904000, while the sum is 68.

The spelling of 28666505593940 in words is "twenty-eight trillion, six hundred sixty-six billion, five hundred five million, five hundred ninety-three thousand, nine hundred forty".