28364400681 has 8 divisors (see below), whose sum is σ = 38030482080. Its totient is φ = 18803959872.

The previous prime is 28364400679. The next prime is 28364400697. The reversal of 28364400681 is 18600446382.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28364400681 - 2¹ = 28364400679 is a prime.

It is a super-2 number, since 2×28364400681² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (28364400611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26409520 + ... + 26410593.

It is an arithmetic number, because the mean of its divisors is an integer number (4753810260).

Almost surely, 2^28364400681 is an apocalyptic number.

It is an amenable number.

28364400681 is a deficient number, since it is larger than the sum of its proper divisors (9666081399).

28364400681 is a wasteful number, since it uses less digits than its factorization.

28364400681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52820295.

The product of its (nonzero) digits is 221184, while the sum is 42.

The spelling of 28364400681 in words is "twenty-eight billion, three hundred sixty-four million, four hundred thousand, six hundred eighty-one".