647061765 has 16 divisors (see below), whose sum is σ = 1183198848. Its totient is φ = 295799616.

The previous prime is 647061763. The next prime is 647061781. The reversal of 647061765 is 567160746.

It is not a de Polignac number, because 647061765 - 2¹ = 647061763 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647061763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3081142 + ... + 3081351.

It is an arithmetic number, because the mean of its divisors is an integer number (73949928).

Almost surely, 2^647061765 is an apocalyptic number.

It is an amenable number.

647061765 is a deficient number, since it is larger than the sum of its proper divisors (536137083).

647061765 is a wasteful number, since it uses less digits than its factorization.

647061765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6162508.

The product of its (nonzero) digits is 211680, while the sum is 42.

The square root of 647061765 is about 25437.4087713352. The cubic root of 647061765 is about 864.9318956928.

The spelling of 647061765 in words is "six hundred forty-seven million, sixty-one thousand, seven hundred sixty-five".