28287322613 has 4 divisors (see below), whose sum is σ = 30858897408. Its totient is φ = 25715747820.

The previous prime is 28287322597. The next prime is 28287322631. The reversal of 28287322613 is 31622378282.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28287322613 - 2⁴ = 28287322597 is a prime.

It is a super-3 number, since 3×28287322613³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28287322633) 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, 1285787381 + ... + 1285787402.

It is an arithmetic number, because the mean of its divisors is an integer number (7714724352).

Almost surely, 2^28287322613 is an apocalyptic number.

It is an amenable number.

28287322613 is a deficient number, since it is larger than the sum of its proper divisors (2571574795).

28287322613 is a wasteful number, since it uses less digits than its factorization.

28287322613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2571574794.

The product of its digits is 387072, while the sum is 44.

The spelling of 28287322613 in words is "twenty-eight billion, two hundred eighty-seven million, three hundred twenty-two thousand, six hundred thirteen".