7318072281 has 16 divisors (see below), whose sum is σ = 11061055040. Its totient is φ = 4266406080.

The previous prime is 7318072241. The next prime is 7318072301. The reversal of 7318072281 is 1822708137.

It is not a de Polignac number, because 7318072281 - 2²³ = 7309683673 is a prime.

It is a super-2 number, since 2×7318072281² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7318072231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4937230 + ... + 4938711.

It is an arithmetic number, because the mean of its divisors is an integer number (691315940).

Almost surely, 2^7318072281 is an apocalyptic number.

It is an amenable number.

7318072281 is a deficient number, since it is larger than the sum of its proper divisors (3742982759).

7318072281 is a wasteful number, since it uses less digits than its factorization.

7318072281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9875976.

The product of its (nonzero) digits is 37632, while the sum is 39.

The square root of 7318072281 is about 85545.7321027765. The cubic root of 7318072281 is about 1941.4769177289.

The spelling of 7318072281 in words is "seven billion, three hundred eighteen million, seventy-two thousand, two hundred eighty-one".