809631427988 has 12 divisors (see below), whose sum is σ = 1438002088992. Its totient is φ = 398773688280.

The previous prime is 809631427919. The next prime is 809631428129. The reversal of 809631427988 is 889724136908.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1510506128 + ... + 1510506663.

It is an arithmetic number, because the mean of its divisors is an integer number (119833507416).

Almost surely, 2^809631427988 is an apocalyptic number.

It is an amenable number.

809631427988 is a deficient number, since it is larger than the sum of its proper divisors (628370661004).

809631427988 is a wasteful number, since it uses less digits than its factorization.

809631427988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3021012862 (or 3021012860 counting only the distinct ones).

The product of its (nonzero) digits is 41803776, while the sum is 65.

The spelling of 809631427988 in words is "eight hundred nine billion, six hundred thirty-one million, four hundred twenty-seven thousand, nine hundred eighty-eight".