57720563 has 4 divisors (see below), whose sum is σ = 57873240. Its totient is φ = 57567888.

The previous prime is 57720541. The next prime is 57720571. The reversal of 57720563 is 36502775.

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

It is a cyclic number.

It is not a de Polignac number, because 57720563 - 2⁸ = 57720307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57720583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75770 + ... + 76527.

It is an arithmetic number, because the mean of its divisors is an integer number (14468310).

Almost surely, 2^57720563 is an apocalyptic number.

57720563 is a deficient number, since it is larger than the sum of its proper divisors (152677).

57720563 is a wasteful number, since it uses less digits than its factorization.

57720563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152676.

The product of its (nonzero) digits is 44100, while the sum is 35.

The square root of 57720563 is about 7597.4050175043. The cubic root of 57720563 is about 386.4650158256.

The spelling of 57720563 in words is "fifty-seven million, seven hundred twenty thousand, five hundred sixty-three".