7287991344 has 30 divisors (see below), whose sum is σ = 20396253956. Its totient is φ = 2429330400.

The previous prime is 7287991331. The next prime is 7287991411. The reversal of 7287991344 is 4431997827.

It is a super-2 number, since 2×7287991344² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 25305382 + ... + 25305669.

Almost surely, 2^7287991344 is an apocalyptic number.

It is an amenable number.

7287991344 is an abundant number, since it is smaller than the sum of its proper divisors (13108262612).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7287991344 is a wasteful number, since it uses less digits than its factorization.

7287991344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50611065 (or 50611056 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 54.

The square root of 7287991344 is about 85369.7331845426. The cubic root of 7287991344 is about 1938.8131175024.

The spelling of 7287991344 in words is "seven billion, two hundred eighty-seven million, nine hundred ninety-one thousand, three hundred forty-four".