632643965 has 4 divisors (see below), whose sum is σ = 759172764. Its totient is φ = 506115168.

The previous prime is 632643959. The next prime is 632643971. The reversal of 632643965 is 569346236.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (632643959) and next prime (632643971).

It can be written as a sum of positive squares in 2 ways, for example, as 130256569 + 502387396 = 11413^2 + 22414^2 .

It is a cyclic number.

It is not a de Polignac number, because 632643965 - 2⁸ = 632643709 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63264392 + ... + 63264401.

It is an arithmetic number, because the mean of its divisors is an integer number (189793191).

Almost surely, 2^632643965 is an apocalyptic number.

It is an amenable number.

632643965 is a deficient number, since it is larger than the sum of its proper divisors (126528799).

632643965 is a wasteful number, since it uses less digits than its factorization.

632643965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126528798.

The product of its digits is 699840, while the sum is 44.

The square root of 632643965 is about 25152.4146952137. The cubic root of 632643965 is about 858.4594580950.

The spelling of 632643965 in words is "six hundred thirty-two million, six hundred forty-three thousand, nine hundred sixty-five".