646265 has 8 divisors (see below), whose sum is σ = 802440. Its totient is φ = 499072.

The previous prime is 646259. The next prime is 646267. The reversal of 646265 is 562646.

It can be written as a sum of positive squares in 4 ways, for example, as 116281 + 529984 = 341^2 + 728^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646265 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 646265.

It is not an unprimeable number, because it can be changed into a prime (646267) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2084 + ... + 2373.

It is an arithmetic number, because the mean of its divisors is an integer number (100305).

2⁶⁴⁶²⁶⁵ is an apocalyptic number.

It is an amenable number.

646265 is a deficient number, since it is larger than the sum of its proper divisors (156175).

646265 is a wasteful number, since it uses less digits than its factorization.

646265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4491.

The product of its digits is 8640, while the sum is 29.

The square root of 646265 is about 803.9060890427. The cubic root of 646265 is about 86.4576736131.

It can be divided in two parts, 64 and 6265, that multiplied together give a triangular number (400960 = T₈₉₅).

The spelling of 646265 in words is "six hundred forty-six thousand, two hundred sixty-five".