57079709 has 4 divisors (see below), whose sum is σ = 57104316. Its totient is φ = 57055104.

The previous prime is 57079663. The next prime is 57079717. The reversal of 57079709 is 90797075.

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

It can be written as a sum of positive squares in 2 ways, for example, as 37027225 + 20052484 = 6085^2 + 4478^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57079709 is a prime.

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 57079709.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57079409) 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, 8414 + ... + 13599.

It is an arithmetic number, because the mean of its divisors is an integer number (14276079).

Almost surely, 2^57079709 is an apocalyptic number.

It is an amenable number.

57079709 is a deficient number, since it is larger than the sum of its proper divisors (24607).

57079709 is a wasteful number, since it uses less digits than its factorization.

57079709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24606.

The product of its (nonzero) digits is 138915, while the sum is 44.

The square root of 57079709 is about 7555.1114485493. Note that the first 3 decimals coincide. The cubic root of 57079709 is about 385.0294214880.

The spelling of 57079709 in words is "fifty-seven million, seventy-nine thousand, seven hundred nine".