29678287693 has 6 divisors (see below), whose sum is σ = 31526762666. Its totient is φ = 27932505792.

The previous prime is 29678287687. The next prime is 29678287753. The reversal of 29678287693 is 39678287692.

It can be written as a sum of positive squares in 3 ways, for example, as 14752045764 + 14926241929 = 121458^2 + 122173^2 .

It is not a de Polignac number, because 29678287693 - 2²¹ = 29676190541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29678287643) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 51346230 + ... + 51346807.

Almost surely, 2^29678287693 is an apocalyptic number.

It is an amenable number.

29678287693 is a deficient number, since it is larger than the sum of its proper divisors (1848474973).

29678287693 is a wasteful number, since it uses less digits than its factorization.

29678287693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102693071 (or 102693054 counting only the distinct ones).

The product of its digits is 109734912, while the sum is 67.

Subtracting 29678287693 from its reverse (39678287692), we obtain a palindrome (9999999999).

The spelling of 29678287693 in words is "twenty-nine billion, six hundred seventy-eight million, two hundred eighty-seven thousand, six hundred ninety-three".