7902719217 has 6 divisors (see below), whose sum is σ = 11415038882. Its totient is φ = 5268479472.

The previous prime is 7902719203. The next prime is 7902719221. The reversal of 7902719217 is 7129172097.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 5414605056 + 2488114161 = 73584^2 + 49881^2 .

It is not a de Polignac number, because 7902719217 - 2⁸ = 7902718961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7902719257) by changing a digit.

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, 439039948 + ... + 439039965.

Almost surely, 2^7902719217 is an apocalyptic number.

It is an amenable number.

7902719217 is a deficient number, since it is larger than the sum of its proper divisors (3512319665).

7902719217 is a wasteful number, since it uses less digits than its factorization.

7902719217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 878079919 (or 878079916 counting only the distinct ones).

The product of its (nonzero) digits is 111132, while the sum is 45.

The square root of 7902719217 is about 88897.2396478091. The cubic root of 7902719217 is about 1991.8601847301.

The spelling of 7902719217 in words is "seven billion, nine hundred two million, seven hundred nineteen thousand, two hundred seventeen".