642169364 has 12 divisors (see below), whose sum is σ = 1124289684. Its totient is φ = 320943744.

The previous prime is 642169351. The next prime is 642169379. The reversal of 642169364 is 463961246.

It can be written as a sum of positive squares in 2 ways, for example, as 146216464 + 495952900 = 12092^2 + 22270^2 .

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, 24629 + ... + 43484.

It is an arithmetic number, because the mean of its divisors is an integer number (93690807).

Almost surely, 2^642169364 is an apocalyptic number.

It is an amenable number.

642169364 is a deficient number, since it is larger than the sum of its proper divisors (482120320).

642169364 is a wasteful number, since it uses less digits than its factorization.

642169364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70474 (or 70472 counting only the distinct ones).

The product of its digits is 186624, while the sum is 41.

The square root of 642169364 is about 25341.0608302020. The cubic root of 642169364 is about 862.7464764737.

The spelling of 642169364 in words is "six hundred forty-two million, one hundred sixty-nine thousand, three hundred sixty-four".