28309836986393 has 4 divisors (see below), whose sum is σ = 28309968023988. Its totient is φ = 28309705948800.

The previous prime is 28309836986369. The next prime is 28309836986411. The reversal of 28309836986393 is 39368963890382.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21729647511049 + 6580189475344 = 4661507^2 + 2565188^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28309836986393 is a prime.

It is a super-2 number, since 2×28309836986393² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28309836986303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65194196 + ... + 65626997.

It is an arithmetic number, because the mean of its divisors is an integer number (7077492005997).

Almost surely, 2^{28309836986393} is an apocalyptic number.

It is an amenable number.

28309836986393 is a deficient number, since it is larger than the sum of its proper divisors (131037595).

28309836986393 is a wasteful number, since it uses less digits than its factorization.

28309836986393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131037594.

The product of its (nonzero) digits is 2176782336, while the sum is 77.

The spelling of 28309836986393 in words is "twenty-eight trillion, three hundred nine billion, eight hundred thirty-six million, nine hundred eighty-six thousand, three hundred ninety-three".