15780726872 has 16 divisors (see below), whose sum is σ = 29678260200. Its totient is φ = 7866524160.

The previous prime is 15780726827. The next prime is 15780726877. The reversal of 15780726872 is 27862708751.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15780726877) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2977097 + ... + 2982392.

Almost surely, 2^15780726872 is an apocalyptic number.

It is an amenable number.

15780726872 is a deficient number, since it is larger than the sum of its proper divisors (13897533328).

15780726872 is a wasteful number, since it uses less digits than its factorization.

15780726872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5959826 (or 5959822 counting only the distinct ones).

The product of its (nonzero) digits is 2634240, while the sum is 53.

The spelling of 15780726872 in words is "fifteen billion, seven hundred eighty million, seven hundred twenty-six thousand, eight hundred seventy-two".