15778000720 has 20 divisors (see below), whose sum is σ = 36683851860. Its totient is φ = 6311200256.

The previous prime is 15778000717. The next prime is 15778000727. The reversal of 15778000720 is 2700087751.

15778000720 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 2 ways, for example, as 7339006224 + 8438994496 = 85668^2 + 91864^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 15778000720.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15778000727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98612425 + ... + 98612584.

It is an arithmetic number, because the mean of its divisors is an integer number (1834192593).

Almost surely, 2^15778000720 is an apocalyptic number.

15778000720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15778000720 is an abundant number, since it is smaller than the sum of its proper divisors (20905851140).

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

15778000720 is a wasteful number, since it uses less digits than its factorization.

15778000720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197225022 (or 197225016 counting only the distinct ones).

The product of its (nonzero) digits is 27440, while the sum is 37.

The spelling of 15778000720 in words is "fifteen billion, seven hundred seventy-eight million, seven hundred twenty", and thus it is an aban number.