78726271 has 16 divisors (see below), whose sum is σ = 88099200. Its totient is φ = 69850368.

The previous prime is 78726257. The next prime is 78726281. The reversal of 78726271 is 17262787.

It is a cyclic number.

It is not a de Polignac number, because 78726271 - 2¹⁹ = 78201983 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 (78726281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138075 + ... + 138643.

It is an arithmetic number, because the mean of its divisors is an integer number (5506200).

Almost surely, 2^78726271 is an apocalyptic number.

78726271 is a deficient number, since it is larger than the sum of its proper divisors (9372929).

78726271 is a wasteful number, since it uses less digits than its factorization.

78726271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 978.

The product of its digits is 65856, while the sum is 40.

The square root of 78726271 is about 8872.7825962321. The cubic root of 78726271 is about 428.5878880081.

It can be divided in two parts, 7 and 8726271, that added together give a palindrome (8726278).

The spelling of 78726271 in words is "seventy-eight million, seven hundred twenty-six thousand, two hundred seventy-one".