7520721320 has 32 divisors (see below), whose sum is σ = 19338998400. Its totient is φ = 2578532928.

The previous prime is 7520721301. The next prime is 7520721347. The reversal of 7520721320 is 231270257.

It is a super-2 number, since 2×7520721320² (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 7 ways as a sum of consecutive naturals, for example, 13429580 + ... + 13430139.

It is an arithmetic number, because the mean of its divisors is an integer number (604343700).

Almost surely, 2^7520721320 is an apocalyptic number.

7520721320 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

7520721320 is an abundant number, since it is smaller than the sum of its proper divisors (11818277080).

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

7520721320 is a wasteful number, since it uses less digits than its factorization.

7520721320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26859737 (or 26859733 counting only the distinct ones).

The product of its (nonzero) digits is 5880, while the sum is 29.

The square root of 7520721320 is about 86722.0924563055. The cubic root of 7520721320 is about 1959.2348568337.

Adding to 7520721320 its reverse (231270257), we get a palindrome (7751991577).

The spelling of 7520721320 in words is "seven billion, five hundred twenty million, seven hundred twenty-one thousand, three hundred twenty".