78966271 has 4 divisors (see below), whose sum is σ = 80078544. Its totient is φ = 77854000.

The previous prime is 78966257. The next prime is 78966281. The reversal of 78966271 is 17266987.

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: 17266987 = 71 ⋅243197.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78966271 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 (78966211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 556030 + ... + 556171.

It is an arithmetic number, because the mean of its divisors is an integer number (20019636).

Almost surely, 2^78966271 is an apocalyptic number.

78966271 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

78966271 is a deficient number, since it is larger than the sum of its proper divisors (1112273).

78966271 is a wasteful number, since it uses less digits than its factorization.

78966271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1112272.

The product of its digits is 254016, while the sum is 46.

The square root of 78966271 is about 8886.2968102579. The cubic root of 78966271 is about 429.0229682897.

The spelling of 78966271 in words is "seventy-eight million, nine hundred sixty-six thousand, two hundred seventy-one".