7287723865 has 4 divisors (see below), whose sum is σ = 8745268644. Its totient is φ = 5830179088.

The previous prime is 7287723853. The next prime is 7287723869. The reversal of 7287723865 is 5683277827.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5291689536 + 1996034329 = 72744^2 + 44677^2 .

It is a cyclic number.

It is not a de Polignac number, because 7287723865 - 2²¹ = 7285626713 is a prime.

It is a super-2 number, since 2×7287723865² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7287723869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 728772382 + ... + 728772391.

It is an arithmetic number, because the mean of its divisors is an integer number (2186317161).

Almost surely, 2^7287723865 is an apocalyptic number.

It is an amenable number.

7287723865 is a deficient number, since it is larger than the sum of its proper divisors (1457544779).

7287723865 is a wasteful number, since it uses less digits than its factorization.

7287723865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1457544778.

The product of its digits is 7902720, while the sum is 55.

The square root of 7287723865 is about 85368.1665786492. The cubic root of 7287723865 is about 1938.7893982033.

The spelling of 7287723865 in words is "seven billion, two hundred eighty-seven million, seven hundred twenty-three thousand, eight hundred sixty-five".