636591946 has 8 divisors (see below), whose sum is σ = 971072640. Its totient is φ = 312901068.

The previous prime is 636591931. The next prime is 636591971. The reversal of 636591946 is 649195636.

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

It is a self number, because there is not a number n which added to its sum of digits gives 636591946.

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, 2697306 + ... + 2697541.

It is an arithmetic number, because the mean of its divisors is an integer number (121384080).

Almost surely, 2^636591946 is an apocalyptic number.

636591946 is a deficient number, since it is larger than the sum of its proper divisors (334480694).

636591946 is a wasteful number, since it uses less digits than its factorization.

636591946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5394908.

The product of its digits is 1049760, while the sum is 49.

The square root of 636591946 is about 25230.7737891647. The cubic root of 636591946 is about 860.2414798718.

The spelling of 636591946 in words is "six hundred thirty-six million, five hundred ninety-one thousand, nine hundred forty-six".