57456649 has 2 divisors, whose sum is σ = 57456650. Its totient is φ = 57456648.

The previous prime is 57456647. The next prime is 57456683. The reversal of 57456649 is 94665475.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32775625 + 24681024 = 5725^2 + 4968^2 .

It is a cyclic number.

It is not a de Polignac number, because 57456649 - 2¹ = 57456647 is a prime.

Together with 57456647, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 57456599 and 57456608.

It is not a weakly prime, because it can be changed into another prime (57456647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28728324 + 28728325.

It is an arithmetic number, because the mean of its divisors is an integer number (28728325).

Almost surely, 2^57456649 is an apocalyptic number.

It is an amenable number.

57456649 is a deficient number, since it is larger than the sum of its proper divisors (1).

57456649 is an equidigital number, since it uses as much as digits as its factorization.

57456649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 907200, while the sum is 46.

The square root of 57456649 is about 7580.0164247843. The cubic root of 57456649 is about 385.8751083688.

The spelling of 57456649 in words is "fifty-seven million, four hundred fifty-six thousand, six hundred forty-nine".