647320763 has 16 divisors (see below), whose sum is σ = 685532160. Its totient is φ = 610002624.

The previous prime is 647320757. The next prime is 647320771. The reversal of 647320763 is 367023746.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 647320763 - 2¹⁴ = 647304379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (647320963) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 947420 + ... + 948102.

It is an arithmetic number, because the mean of its divisors is an integer number (42845760).

Almost surely, 2^647320763 is an apocalyptic number.

647320763 is a deficient number, since it is larger than the sum of its proper divisors (38211397).

647320763 is a wasteful number, since it uses less digits than its factorization.

647320763 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1258.

The product of its (nonzero) digits is 127008, while the sum is 38.

The square root of 647320763 is about 25442.4991500442. The cubic root of 647320763 is about 865.0472817662.

The spelling of 647320763 in words is "six hundred forty-seven million, three hundred twenty thousand, seven hundred sixty-three".