7215759540 has 144 divisors (see below), whose sum is σ = 24269446656. Its totient is φ = 1720569600.

The previous prime is 7215759539. The next prime is 7215759541. The reversal of 7215759540 is 459575127.

7215759540 is a `hidden beast` number, since 7 + 2 + 1 + 57 + 59 + 540 = 666.

It is an interprime number because it is at equal distance from previous prime (7215759539) and next prime (7215759541).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7215759541) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 90909 + ... + 150651.

It is an arithmetic number, because the mean of its divisors is an integer number (168537824).

Almost surely, 2^7215759540 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7215759540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12134723328).

7215759540 is an abundant number, since it is smaller than the sum of its proper divisors (17053687116).

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

7215759540 is a wasteful number, since it uses less digits than its factorization.

7215759540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59830 (or 59825 counting only the distinct ones).

The product of its (nonzero) digits is 441000, while the sum is 45.

The square root of 7215759540 is about 84945.6269621927. The cubic root of 7215759540 is about 1932.3866007462.

The spelling of 7215759540 in words is "seven billion, two hundred fifteen million, seven hundred fifty-nine thousand, five hundred forty".