15438768636 has 24 divisors (see below), whose sum is σ = 36244802944. Its totient is φ = 5114683440.

The previous prime is 15438768619. The next prime is 15438768647. The reversal of 15438768636 is 63686783451.

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 7 ways as a sum of consecutive naturals, for example, 3944560 + ... + 3948471.

Almost surely, 2^15438768636 is an apocalyptic number.

It is an amenable number.

15438768636 is an abundant number, since it is smaller than the sum of its proper divisors (20806034308).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15438768636 is a wasteful number, since it uses less digits than its factorization.

15438768636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7893201 (or 7893199 counting only the distinct ones).

The product of its digits is 17418240, while the sum is 57.

The spelling of 15438768636 in words is "fifteen billion, four hundred thirty-eight million, seven hundred sixty-eight thousand, six hundred thirty-six".