7207506721 has 8 divisors (see below), whose sum is σ = 7665066080. Its totient is φ = 6757769088.

The previous prime is 7207506703. The next prime is 7207506739. The reversal of 7207506721 is 1276057027.

It is an interprime number because it is at equal distance from previous prime (7207506703) and next prime (7207506739).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7207506721 - 2⁵ = 7207506689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7207509721) by changing a digit.

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, 1953531 + ... + 1957216.

It is an arithmetic number, because the mean of its divisors is an integer number (958133260).

Almost surely, 2^7207506721 is an apocalyptic number.

It is an amenable number.

7207506721 is a deficient number, since it is larger than the sum of its proper divisors (457559359).

7207506721 is a wasteful number, since it uses less digits than its factorization.

7207506721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3910863.

The product of its (nonzero) digits is 41160, while the sum is 37.

The square root of 7207506721 is about 84897.0359965529. The cubic root of 7207506721 is about 1931.6496157014.

The spelling of 7207506721 in words is "seven billion, two hundred seven million, five hundred six thousand, seven hundred twenty-one".