78827291 has 4 divisors (see below), whose sum is σ = 78908952. Its totient is φ = 78745632.

The previous prime is 78827263. The next prime is 78827293. The reversal of 78827291 is 19272887.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78827291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78827293) 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, 39365 + ... + 41318.

It is an arithmetic number, because the mean of its divisors is an integer number (19727238).

Almost surely, 2^78827291 is an apocalyptic number.

78827291 is a deficient number, since it is larger than the sum of its proper divisors (81661).

78827291 is an equidigital number, since it uses as much as digits as its factorization.

78827291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81660.

The product of its digits is 112896, while the sum is 44.

The square root of 78827291 is about 8878.4734611306. The cubic root of 78827291 is about 428.7711281652.

The spelling of 78827291 in words is "seventy-eight million, eight hundred twenty-seven thousand, two hundred ninety-one".