28691313351 has 4 divisors (see below), whose sum is σ = 38255084472. Its totient is φ = 19127542232.

The previous prime is 28691313317. The next prime is 28691313367. The reversal of 28691313351 is 15331319682.

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

It is a cyclic number.

It is not a de Polignac number, because 28691313351 - 2¹¹ = 28691311303 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28691383351) 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, 4781885556 + ... + 4781885561.

It is an arithmetic number, because the mean of its divisors is an integer number (9563771118).

Almost surely, 2^28691313351 is an apocalyptic number.

28691313351 is a deficient number, since it is larger than the sum of its proper divisors (9563771121).

28691313351 is an equidigital number, since it uses as much as digits as its factorization.

28691313351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9563771120.

The product of its digits is 116640, while the sum is 42.

The spelling of 28691313351 in words is "twenty-eight billion, six hundred ninety-one million, three hundred thirteen thousand, three hundred fifty-one".