721112520 has 32 divisors (see below), whose sum is σ = 2163337920. Its totient is φ = 192296640.

The previous prime is 721112503. The next prime is 721112531. The reversal of 721112520 is 25211127.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3004516 + ... + 3004755.

It is an arithmetic number, because the mean of its divisors is an integer number (67604310).

Almost surely, 2^721112520 is an apocalyptic number.

It is an amenable number.

721112520 is an abundant number, since it is smaller than the sum of its proper divisors (1442225400).

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

721112520 is a wasteful number, since it uses less digits than its factorization.

721112520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6009285 (or 6009281 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 21.

The square root of 721112520 is about 26853.5383143451. The cubic root of 721112520 is about 896.7423462302.

Adding to 721112520 its reverse (25211127), we get a palindrome (746323647).

The spelling of 721112520 in words is "seven hundred twenty-one million, one hundred twelve thousand, five hundred twenty".