15778388728804 has 27 divisors (see below), whose sum is σ = 29899775533467. Its totient is φ = 7282285593024.

The previous prime is 15778388728793. The next prime is 15778388728807. The reversal of 15778388728804 is 40882788387751.

The square root of 15778388728804 is 3972202.

It is a perfect power (a square), and thus also a powerful number.

15778388728804 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 4162016170404 + 11616372558400 = 2040102^2 + 3408280^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15778388728807) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 103200864 + ... + 103353640.

Almost surely, 2^{15778388728804} is an apocalyptic number.

15778388728804 is the 3972202-nd square number.

It is an amenable number.

15778388728804 is a deficient number, since it is larger than the sum of its proper divisors (14121386804663).

15778388728804 is an frugal number, since it uses more digits than its factorization.

15778388728804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305584 (or 152792 counting only the distinct ones).

The product of its (nonzero) digits is 1348730880, while the sum is 76.

The spelling of 15778388728804 in words is "fifteen trillion, seven hundred seventy-eight billion, three hundred eighty-eight million, seven hundred twenty-eight thousand, eight hundred four".