57720671 has 4 divisors (see below), whose sum is σ = 57744144. Its totient is φ = 57697200.

The previous prime is 57720647. The next prime is 57720673. The reversal of 57720671 is 17602775.

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-57720671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57720673) 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, 7550 + ... + 13131.

It is an arithmetic number, because the mean of its divisors is an integer number (14436036).

Almost surely, 2^57720671 is an apocalyptic number.

57720671 is a deficient number, since it is larger than the sum of its proper divisors (23473).

57720671 is a wasteful number, since it uses less digits than its factorization.

57720671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23472.

The product of its (nonzero) digits is 20580, while the sum is 35.

The square root of 57720671 is about 7597.4121251911. The cubic root of 57720671 is about 386.4652568616.

The spelling of 57720671 in words is "fifty-seven million, seven hundred twenty thousand, six hundred seventy-one".