71648391 has 8 divisors (see below), whose sum is σ = 98113264. Its totient is φ = 46474560.

The previous prime is 71648389. The next prime is 71648399. The reversal of 71648391 is 19384617.

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

It is not a de Polignac number, because 71648391 - 2¹ = 71648389 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 (71648399) 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, 322630 + ... + 322851.

It is an arithmetic number, because the mean of its divisors is an integer number (12264158).

Almost surely, 2^71648391 is an apocalyptic number.

71648391 is a deficient number, since it is larger than the sum of its proper divisors (26464873).

71648391 is a wasteful number, since it uses less digits than its factorization.

71648391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645521.

The product of its digits is 36288, while the sum is 39.

The square root of 71648391 is about 8464.5372584684. The cubic root of 71648391 is about 415.3384590716.

The spelling of 71648391 in words is "seventy-one million, six hundred forty-eight thousand, three hundred ninety-one".