647057 has 2 divisors, whose sum is σ = 647058. Its totient is φ = 647056.

The previous prime is 647047. The next prime is 647069. The reversal of 647057 is 750746.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 591361 + 55696 = 769^2 + 236^2 .

It is a cyclic number.

It is not a de Polignac number, because 647057 - 2⁶ = 646993 is a prime.

It is a super-2 number, since 2×647057² = 837365522498, which contains 22 as substring.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 647057.

It is not a weakly prime, because it can be changed into another prime (647047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323528 + 323529.

It is an arithmetic number, because the mean of its divisors is an integer number (323529).

2⁶⁴⁷⁰⁵⁷ is an apocalyptic number.

It is an amenable number.

647057 is a deficient number, since it is larger than the sum of its proper divisors (1).

647057 is an equidigital number, since it uses as much as digits as its factorization.

647057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5880, while the sum is 29.

The square root of 647057 is about 804.3985330668. The cubic root of 647057 is about 86.4929772552.

The spelling of 647057 in words is "six hundred forty-seven thousand, fifty-seven".