71623 has 4 divisors (see below), whose sum is σ = 72760. Its totient is φ = 70488.

The previous prime is 71597. The next prime is 71633. The reversal of 71623 is 32617.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71623 is a prime.

It is a Duffinian number.

71623 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 71623.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71633) 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, 468 + ... + 601.

It is an arithmetic number, because the mean of its divisors is an integer number (18190).

2⁷¹⁶²³ is an apocalyptic number.

71623 is a deficient number, since it is larger than the sum of its proper divisors (1137).

71623 is a wasteful number, since it uses less digits than its factorization.

71623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1136.

The product of its digits is 252, while the sum is 19.

The square root of 71623 is about 267.6247372722. The cubic root of 71623 is about 41.5289390257.

The spelling of 71623 in words is "seventy-one thousand, six hundred twenty-three".