71397573 has 16 divisors (see below), whose sum is σ = 107916480. Its totient is φ = 41624064.

The previous prime is 71397539. The next prime is 71397631. The reversal of 71397573 is 37579317.

It is not a de Polignac number, because 71397573 - 2²⁰ = 70348997 is a prime.

It is a super-2 number, since 2×71397573² = 10195226860580658, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71397973) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47436 + ... + 48917.

It is an arithmetic number, because the mean of its divisors is an integer number (6744780).

Almost surely, 2^71397573 is an apocalyptic number.

It is an amenable number.

71397573 is a deficient number, since it is larger than the sum of its proper divisors (36518907).

71397573 is a wasteful number, since it uses less digits than its factorization.

71397573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96388.

The product of its digits is 138915, while the sum is 42.

The square root of 71397573 is about 8449.7084565090. The cubic root of 71397573 is about 414.8532369219.

The spelling of 71397573 in words is "seventy-one million, three hundred ninety-seven thousand, five hundred seventy-three".