47644657 has 2 divisors, whose sum is σ = 47644658. Its totient is φ = 47644656.

The previous prime is 47644603. The next prime is 47644669. The reversal of 47644657 is 75644674.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38638656 + 9006001 = 6216^2 + 3001^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47644657 is a prime.

It is not a weakly prime, because it can be changed into another prime (47644697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23822328 + 23822329.

It is an arithmetic number, because the mean of its divisors is an integer number (23822329).

Almost surely, 2^47644657 is an apocalyptic number.

It is an amenable number.

47644657 is a deficient number, since it is larger than the sum of its proper divisors (1).

47644657 is an equidigital number, since it uses as much as digits as its factorization.

47644657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 564480, while the sum is 43.

The square root of 47644657 is about 6902.5109199479. The cubic root of 47644657 is about 362.5250893455.

The spelling of 47644657 in words is "forty-seven million, six hundred forty-four thousand, six hundred fifty-seven".