15768781074 has 72 divisors (see below), whose sum is σ = 36219406860. Its totient is φ = 4957402176.

The previous prime is 15768781051. The next prime is 15768781123. The reversal of 15768781074 is 47018786751.

It can be written as a sum of positive squares in 2 ways, for example, as 15739458849 + 29322225 = 125457^2 + 5415^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 15768781074.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1482744 + ... + 1493340.

Almost surely, 2^15768781074 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15768781074, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18109703430).

15768781074 is an abundant number, since it is smaller than the sum of its proper divisors (20450625786).

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

15768781074 is a wasteful number, since it uses less digits than its factorization.

15768781074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10872 (or 10850 counting only the distinct ones).

The product of its (nonzero) digits is 2634240, while the sum is 54.

The spelling of 15768781074 in words is "fifteen billion, seven hundred sixty-eight million, seven hundred eighty-one thousand, seventy-four".