7215443440 has 40 divisors (see below), whose sum is σ = 17317070208. Its totient is φ = 2793073920.

The previous prime is 7215443423. The next prime is 7215443441. The reversal of 7215443440 is 443445127.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 7215443396 and 7215443405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7215443441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1452247 + ... + 1457206.

Almost surely, 2^7215443440 is an apocalyptic number.

It is an amenable number.

7215443440 is an abundant number, since it is smaller than the sum of its proper divisors (10101626768).

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

7215443440 is a wasteful number, since it uses less digits than its factorization.

7215443440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2909497 (or 2909491 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 34.

The square root of 7215443440 is about 84943.7663398557. The cubic root of 7215443440 is about 1932.3583830504.

Adding to 7215443440 its reverse (443445127), we get a palindrome (7658888567).

The spelling of 7215443440 in words is "seven billion, two hundred fifteen million, four hundred forty-three thousand, four hundred forty".