7240870321 has 4 divisors (see below), whose sum is σ = 7247977200. Its totient is φ = 7233763444.

The previous prime is 7240870223. The next prime is 7240870369. The reversal of 7240870321 is 1230780427.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 7240870321 - 2¹⁷ = 7240739249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7240870391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3551911 + ... + 3553948.

It is an arithmetic number, because the mean of its divisors is an integer number (1811994300).

Almost surely, 2^7240870321 is an apocalyptic number.

It is an amenable number.

7240870321 is a deficient number, since it is larger than the sum of its proper divisors (7106879).

7240870321 is a wasteful number, since it uses less digits than its factorization.

7240870321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7106878.

The product of its (nonzero) digits is 18816, while the sum is 34.

The square root of 7240870321 is about 85093.3036202027. The cubic root of 7240870321 is about 1934.6255684596.

The spelling of 7240870321 in words is "seven billion, two hundred forty million, eight hundred seventy thousand, three hundred twenty-one".