71320057 has 8 divisors (see below), whose sum is σ = 73794560. Its totient is φ = 68856480.

The previous prime is 71320043. The next prime is 71320087. The reversal of 71320057 is 75002317.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71320057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71320087) 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, 11869 + ... + 16837.

It is an arithmetic number, because the mean of its divisors is an integer number (9224320).

Almost surely, 2^71320057 is an apocalyptic number.

It is an amenable number.

71320057 is a deficient number, since it is larger than the sum of its proper divisors (2474503).

71320057 is a wasteful number, since it uses less digits than its factorization.

71320057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5463.

The product of its (nonzero) digits is 1470, while the sum is 25.

The square root of 71320057 is about 8445.1203070175. The cubic root of 71320057 is about 414.7030478373.

The spelling of 71320057 in words is "seventy-one million, three hundred twenty thousand, fifty-seven".