71678391 has 8 divisors (see below), whose sum is σ = 95679744. Its totient is φ = 47731320.

The previous prime is 71678389. The next prime is 71678413. The reversal of 71678391 is 19387617.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 71678391 - 2¹ = 71678389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71678311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10381 + ... + 15846.

It is an arithmetic number, because the mean of its divisors is an integer number (11959968).

Almost surely, 2^71678391 is an apocalyptic number.

71678391 is a deficient number, since it is larger than the sum of its proper divisors (24001353).

71678391 is a wasteful number, since it uses less digits than its factorization.

71678391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27141.

The product of its digits is 63504, while the sum is 42.

The square root of 71678391 is about 8466.3091722426. The cubic root of 71678391 is about 415.3964199690.

The spelling of 71678391 in words is "seventy-one million, six hundred seventy-eight thousand, three hundred ninety-one".