647477 has 2 divisors, whose sum is σ = 647478. Its totient is φ = 647476.

The previous prime is 647453. The next prime is 647489. The reversal of 647477 is 774746.

647477 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 568516 + 78961 = 754^2 + 281^2 .

It is a cyclic number.

It is not a de Polignac number, because 647477 - 2¹⁰ = 646453 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 647477.

It is not a weakly prime, because it can be changed into another prime (647417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323738 + 323739.

It is an arithmetic number, because the mean of its divisors is an integer number (323739).

2⁶⁴⁷⁴⁷⁷ is an apocalyptic number.

It is an amenable number.

647477 is a deficient number, since it is larger than the sum of its proper divisors (1).

647477 is an equidigital number, since it uses as much as digits as its factorization.

647477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32928, while the sum is 35.

The square root of 647477 is about 804.6595553400. The cubic root of 647477 is about 86.5116871954.

The spelling of 647477 in words is "six hundred forty-seven thousand, four hundred seventy-seven".