57775721 has 2 divisors, whose sum is σ = 57775722. Its totient is φ = 57775720.

The previous prime is 57775693. The next prime is 57775769. The reversal of 57775721 is 12757775.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33223696 + 24552025 = 5764^2 + 4955^2 .

It is a cyclic number.

It is not a de Polignac number, because 57775721 - 2¹⁰ = 57774697 is a prime.

It is not a weakly prime, because it can be changed into another prime (57775021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28887860 + 28887861.

It is an arithmetic number, because the mean of its divisors is an integer number (28887861).

Almost surely, 2^57775721 is an apocalyptic number.

It is an amenable number.

57775721 is a deficient number, since it is larger than the sum of its proper divisors (1).

57775721 is an equidigital number, since it uses as much as digits as its factorization.

57775721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120050, while the sum is 41.

The square root of 57775721 is about 7601.0342059486. The cubic root of 57775721 is about 386.5880791370.

The spelling of 57775721 in words is "fifty-seven million, seven hundred seventy-five thousand, seven hundred twenty-one".