71256623 has 4 divisors (see below), whose sum is σ = 71650488. Its totient is φ = 70862760.

The previous prime is 71256613. The next prime is 71256629. The reversal of 71256623 is 32665217.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32665217 = 13 ⋅2512709.

It is a cyclic number.

It is not a de Polignac number, because 71256623 - 2⁴ = 71256607 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71256623.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71256629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 196661 + ... + 197022.

It is an arithmetic number, because the mean of its divisors is an integer number (17912622).

Almost surely, 2^71256623 is an apocalyptic number.

71256623 is a deficient number, since it is larger than the sum of its proper divisors (393865).

71256623 is a wasteful number, since it uses less digits than its factorization.

71256623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393864.

The product of its digits is 15120, while the sum is 32.

The square root of 71256623 is about 8441.3638116124. The cubic root of 71256623 is about 414.5800619749.

The spelling of 71256623 in words is "seventy-one million, two hundred fifty-six thousand, six hundred twenty-three".