78634071 has 12 divisors (see below), whose sum is σ = 117789672. Its totient is φ = 52422552.

The previous prime is 78634007. The next prime is 78634091. The reversal of 78634071 is 17043687.

It is not a de Polignac number, because 78634071 - 2⁶ = 78634007 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78634091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 161556 + ... + 162041.

It is an arithmetic number, because the mean of its divisors is an integer number (9815806).

Almost surely, 2^78634071 is an apocalyptic number.

78634071 is a deficient number, since it is larger than the sum of its proper divisors (39155601).

78634071 is an equidigital number, since it uses as much as digits as its factorization.

78634071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323612 (or 323600 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The square root of 78634071 is about 8867.5854097945. The cubic root of 78634071 is about 428.4205095753.

The spelling of 78634071 in words is "seventy-eight million, six hundred thirty-four thousand, seventy-one".