57706721 has 8 divisors (see below), whose sum is σ = 62592264. Its totient is φ = 52986880.

The previous prime is 57706711. The next prime is 57706751. The reversal of 57706721 is 12760775.

It can be written as a sum of positive squares in 4 ways, for example, as 11806096 + 45900625 = 3436^2 + 6775^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 57706721 - 2¹⁴ = 57690337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57706711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40700 + ... + 42093.

It is an arithmetic number, because the mean of its divisors is an integer number (7824033).

Almost surely, 2^57706721 is an apocalyptic number.

It is an amenable number.

57706721 is a deficient number, since it is larger than the sum of its proper divisors (4885543).

57706721 is a wasteful number, since it uses less digits than its factorization.

57706721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82851.

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

The square root of 57706721 is about 7596.4939939422. The cubic root of 57706721 is about 386.4341205597.

The spelling of 57706721 in words is "fifty-seven million, seven hundred six thousand, seven hundred twenty-one".