28736968471 has 4 divisors (see below), whose sum is σ = 28788561432. Its totient is φ = 28685375512.

The previous prime is 28736968457. The next prime is 28736968537. The reversal of 28736968471 is 17486963782.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17486963782 = 2 ⋅8743481891.

It is a cyclic number.

It is not a de Polignac number, because 28736968471 - 2⁵ = 28736968439 is a prime.

It is a super-3 number, since 3×28736968471³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28736978471) 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, 25795645 + ... + 25796758.

It is an arithmetic number, because the mean of its divisors is an integer number (7197140358).

Almost surely, 2^28736968471 is an apocalyptic number.

28736968471 is a deficient number, since it is larger than the sum of its proper divisors (51592961).

28736968471 is an equidigital number, since it uses as much as digits as its factorization.

28736968471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51592960.

The product of its digits is 24385536, while the sum is 61.

The spelling of 28736968471 in words is "twenty-eight billion, seven hundred thirty-six million, nine hundred sixty-eight thousand, four hundred seventy-one".