28696267331 has 4 divisors (see below), whose sum is σ = 29943931152. Its totient is φ = 27448603512.

The previous prime is 28696267307. The next prime is 28696267351. The reversal of 28696267331 is 13376269682.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-28696267331 is a prime.

It is a super-3 number, since 3×28696267331³ (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 not an unprimeable number, because it can be changed into a prime (28696267351) 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, 623831876 + ... + 623831921.

It is an arithmetic number, because the mean of its divisors is an integer number (7485982788).

Almost surely, 2^28696267331 is an apocalyptic number.

28696267331 is a deficient number, since it is larger than the sum of its proper divisors (1247663821).

28696267331 is a wasteful number, since it uses less digits than its factorization.

28696267331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1247663820.

The product of its digits is 3919104, while the sum is 53.

The spelling of 28696267331 in words is "twenty-eight billion, six hundred ninety-six million, two hundred sixty-seven thousand, three hundred thirty-one".