28693425281 has 8 divisors (see below), whose sum is σ = 29875124328. Its totient is φ = 27534672000.

The previous prime is 28693425239. The next prime is 28693425307. The reversal of 28693425281 is 18252439682.

It can be written as a sum of positive squares in 4 ways, for example, as 4642378225 + 24051047056 = 68135^2 + 155084^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 28693425281 - 2⁶ = 28693425217 is a prime.

It is a super-2 number, since 2×28693425281² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28693427281) 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, 5733890 + ... + 5738891.

It is an arithmetic number, because the mean of its divisors is an integer number (3734390541).

Almost surely, 2^28693425281 is an apocalyptic number.

It is an amenable number.

28693425281 is a deficient number, since it is larger than the sum of its proper divisors (1181699047).

28693425281 is a wasteful number, since it uses less digits than its factorization.

28693425281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11472883.

The product of its digits is 1658880, while the sum is 50.

The spelling of 28693425281 in words is "twenty-eight billion, six hundred ninety-three million, four hundred twenty-five thousand, two hundred eighty-one".