636663089 has 8 divisors (see below), whose sum is σ = 663979008. Its totient is φ = 609770880.

The previous prime is 636663061. The next prime is 636663091. The reversal of 636663089 is 980366636.

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

It is a cyclic number.

It is not a de Polignac number, because 636663089 - 2⁸ = 636662833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (636663019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102857 + ... + 108870.

It is an arithmetic number, because the mean of its divisors is an integer number (82997376).

Almost surely, 2^636663089 is an apocalyptic number.

It is an amenable number.

636663089 is a deficient number, since it is larger than the sum of its proper divisors (27315919).

636663089 is a wasteful number, since it uses less digits than its factorization.

636663089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211855.

The product of its (nonzero) digits is 839808, while the sum is 47.

The square root of 636663089 is about 25232.1835955591. The cubic root of 636663089 is about 860.2735244075.

The spelling of 636663089 in words is "six hundred thirty-six million, six hundred sixty-three thousand, eighty-nine".