7972780356 has 18 divisors (see below), whose sum is σ = 20153417102. Its totient is φ = 2657593440.

The previous prime is 7972780331. The next prime is 7972780363. The reversal of 7972780356 is 6530872797.

It can be written as a sum of positive squares in only one way, i.e., 7341062400 + 631717956 = 85680^2 + 25134^2 .

It is a tau number, because it is divible by the number of its divisors (18).

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 5 ways as a sum of consecutive naturals, for example, 110733025 + ... + 110733096.

Almost surely, 2^7972780356 is an apocalyptic number.

It is an amenable number.

7972780356 is an abundant number, since it is smaller than the sum of its proper divisors (12180636746).

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

7972780356 is a wasteful number, since it uses less digits than its factorization.

7972780356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221466131 (or 221466126 counting only the distinct ones).

The product of its (nonzero) digits is 4445280, while the sum is 54.

The square root of 7972780356 is about 89290.4270120823. The cubic root of 7972780356 is about 1997.7291188586.

The spelling of 7972780356 in words is "seven billion, nine hundred seventy-two million, seven hundred eighty thousand, three hundred fifty-six".