57203681 has 4 divisors (see below), whose sum is σ = 57222852. Its totient is φ = 57184512.

The previous prime is 57203621. The next prime is 57203687. The reversal of 57203681 is 18630275.

It is a happy number.

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 13432225 + 43771456 = 3665^2 + 6616^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57203681 is a prime.

It is a super-2 number, since 2×57203681² = 6544522239899522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57203687) 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, 4040 + ... + 11433.

It is an arithmetic number, because the mean of its divisors is an integer number (14305713).

Almost surely, 2^57203681 is an apocalyptic number.

It is an amenable number.

57203681 is a deficient number, since it is larger than the sum of its proper divisors (19171).

57203681 is a wasteful number, since it uses less digits than its factorization.

57203681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19170.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 57203681 is about 7563.3115101786. The cubic root of 57203681 is about 385.3079696957.

The spelling of 57203681 in words is "fifty-seven million, two hundred three thousand, six hundred eighty-one".