641361765 has 64 divisors (see below), whose sum is σ = 1151926272. Its totient is φ = 302054400.

The previous prime is 641361761. The next prime is 641361793. The reversal of 641361765 is 567163146.

It is not a de Polignac number, because 641361765 - 2² = 641361761 is a prime.

It is a super-2 number, since 2×641361765² = 822689827207830450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641361761) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1480989 + ... + 1481421.

It is an arithmetic number, because the mean of its divisors is an integer number (17998848).

Almost surely, 2^641361765 is an apocalyptic number.

It is an amenable number.

641361765 is a deficient number, since it is larger than the sum of its proper divisors (510564507).

641361765 is a wasteful number, since it uses less digits than its factorization.

641361765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690.

The product of its digits is 90720, while the sum is 39.

The square root of 641361765 is about 25325.1212237967. The cubic root of 641361765 is about 862.3846583841.

The spelling of 641361765 in words is "six hundred forty-one million, three hundred sixty-one thousand, seven hundred sixty-five".