7281216788 has 6 divisors (see below), whose sum is σ = 12742129386. Its totient is φ = 3640608392.

The previous prime is 7281216781. The next prime is 7281216793. The reversal of 7281216788 is 8876121827.

It can be written as a sum of positive squares in only one way, i.e., 6905942404 + 375274384 = 83102^2 + 19372^2 .

It is a super-2 number, since 2×7281216788² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7281216781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 910152095 + ... + 910152102.

It is an arithmetic number, because the mean of its divisors is an integer number (2123688231).

Almost surely, 2^7281216788 is an apocalyptic number.

It is an amenable number.

7281216788 is a deficient number, since it is larger than the sum of its proper divisors (5460912598).

7281216788 is a wasteful number, since it uses less digits than its factorization.

7281216788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1820304201 (or 1820304199 counting only the distinct ones).

The product of its digits is 602112, while the sum is 50.

The square root of 7281216788 is about 85330.0462205430. The cubic root of 7281216788 is about 1938.2121896985.

The spelling of 7281216788 in words is "seven billion, two hundred eighty-one million, two hundred sixteen thousand, seven hundred eighty-eight".