7215456440 has 16 divisors (see below), whose sum is σ = 16234777080. Its totient is φ = 2886182560.

The previous prime is 7215456439. The next prime is 7215456481. The reversal of 7215456440 is 446545127.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 7215456394 and 7215456403.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90193166 + ... + 90193245.

Almost surely, 2^7215456440 is an apocalyptic number.

It is an amenable number.

7215456440 is an abundant number, since it is smaller than the sum of its proper divisors (9019320640).

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

7215456440 is a wasteful number, since it uses less digits than its factorization.

7215456440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180386422 (or 180386418 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 38.

The square root of 7215456440 is about 84943.8428610338. The cubic root of 7215456440 is about 1932.3595435539.

The spelling of 7215456440 in words is "seven billion, two hundred fifteen million, four hundred fifty-six thousand, four hundred forty".