57336781 has 2 divisors, whose sum is σ = 57336782. Its totient is φ = 57336780.

The previous prime is 57336761. The next prime is 57336821. The reversal of 57336781 is 18763375.

It is an a-pointer prime, because the next prime (57336821) can be obtained adding 57336781 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37711881 + 19624900 = 6141^2 + 4430^2 .

It is a cyclic number.

It is not a de Polignac number, because 57336781 - 2⁵ = 57336749 is a prime.

It is a super-2 number, since 2×57336781² = 6575012910883922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57336761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28668390 + 28668391.

It is an arithmetic number, because the mean of its divisors is an integer number (28668391).

Almost surely, 2^57336781 is an apocalyptic number.

It is an amenable number.

57336781 is a deficient number, since it is larger than the sum of its proper divisors (1).

57336781 is an equidigital number, since it uses as much as digits as its factorization.

57336781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105840, while the sum is 40.

The square root of 57336781 is about 7572.1054535710. The cubic root of 57336781 is about 385.6065796535.

The spelling of 57336781 in words is "fifty-seven million, three hundred thirty-six thousand, seven hundred eighty-one".