641286964 has 12 divisors (see below), whose sum is σ = 1125263524. Its totient is φ = 319783104.

The previous prime is 641286901. The next prime is 641286973. The reversal of 641286964 is 469682146.

It can be written as a sum of positive squares in 2 ways, for example, as 370947600 + 270339364 = 19260^2 + 16442^2 .

It is a super-2 number, since 2×641286964² = 822497940392674592, which contains 22 as substring.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 213417 + ... + 216400.

Almost surely, 2^641286964 is an apocalyptic number.

It is an amenable number.

641286964 is a deficient number, since it is larger than the sum of its proper divisors (483976560).

641286964 is a wasteful number, since it uses less digits than its factorization.

641286964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430194 (or 430192 counting only the distinct ones).

The product of its digits is 497664, while the sum is 46.

The square root of 641286964 is about 25323.6443664809. The cubic root of 641286964 is about 862.3511308981.

The spelling of 641286964 in words is "six hundred forty-one million, two hundred eighty-six thousand, nine hundred sixty-four".