71507723 has 4 divisors (see below), whose sum is σ = 81723120. Its totient is φ = 61292328.

The previous prime is 71507701. The next prime is 71507741. The reversal of 71507723 is 32770517.

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

It is a cyclic number.

It is not a de Polignac number, because 71507723 - 2²⁶ = 4398859 is a prime.

It is a super-2 number, since 2×71507723² = 10226708897289458, which contains 22 as substring.

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 71507723.

It is not an unprimeable number, because it can be changed into a prime (71507743) 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, 5107688 + ... + 5107701.

It is an arithmetic number, because the mean of its divisors is an integer number (20430780).

Almost surely, 2^71507723 is an apocalyptic number.

71507723 is a deficient number, since it is larger than the sum of its proper divisors (10215397).

71507723 is a wasteful number, since it uses less digits than its factorization.

71507723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10215396.

The product of its (nonzero) digits is 10290, while the sum is 32.

The square root of 71507723 is about 8456.2239208763. The cubic root of 71507723 is about 415.0664682813.

The spelling of 71507723 in words is "seventy-one million, five hundred seven thousand, seven hundred twenty-three".