7807216905 has 24 divisors (see below), whose sum is σ = 13575768648. Its totient is φ = 4150538496.

The previous prime is 7807216903. The next prime is 7807216913. The reversal of 7807216905 is 5096127087.

It can be written as a sum of positive squares in 4 ways, for example, as 221503689 + 7585713216 = 14883^2 + 87096^2 .

It is not a de Polignac number, because 7807216905 - 2¹ = 7807216903 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (7807216903) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 263062 + ... + 291231.

It is an arithmetic number, because the mean of its divisors is an integer number (565657027).

Almost surely, 2^7807216905 is an apocalyptic number.

It is an amenable number.

7807216905 is a deficient number, since it is larger than the sum of its proper divisors (5768551743).

7807216905 is a wasteful number, since it uses less digits than its factorization.

7807216905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554617 (or 554614 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 45.

The square root of 7807216905 is about 88358.4568957607. The cubic root of 7807216905 is about 1983.8039399381.

The spelling of 7807216905 in words is "seven billion, eight hundred seven million, two hundred sixteen thousand, nine hundred five".