78929293291 has 4 divisors (see below), whose sum is σ = 81062517472. Its totient is φ = 76796069112.

The previous prime is 78929293253. The next prime is 78929293363. The reversal of 78929293291 is 19239292987.

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 78929293291 - 2²⁹ = 78392422379 is a prime.

It is a super-2 number, since 2×78929293291² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78929293241) 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, 1066612035 + ... + 1066612108.

It is an arithmetic number, because the mean of its divisors is an integer number (20265629368).

Almost surely, 2^78929293291 is an apocalyptic number.

78929293291 is a deficient number, since it is larger than the sum of its proper divisors (2133224181).

78929293291 is a wasteful number, since it uses less digits than its factorization.

78929293291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2133224180.

The product of its digits is 8817984, while the sum is 61.

The spelling of 78929293291 in words is "seventy-eight billion, nine hundred twenty-nine million, two hundred ninety-three thousand, two hundred ninety-one".