715008721 has 4 divisors (see below), whose sum is σ = 817152832. Its totient is φ = 612864612.

The previous prime is 715008719. The next prime is 715008733. The reversal of 715008721 is 127800517.

It is a happy number.

715008721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 715008721 - 2¹ = 715008719 is a prime.

It is a super-2 number, since 2×715008721² = 1022474942212111682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (715008781) 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, 51072045 + ... + 51072058.

It is an arithmetic number, because the mean of its divisors is an integer number (204288208).

Almost surely, 2^715008721 is an apocalyptic number.

It is an amenable number.

715008721 is a deficient number, since it is larger than the sum of its proper divisors (102144111).

715008721 is a wasteful number, since it uses less digits than its factorization.

715008721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102144110.

The product of its (nonzero) digits is 3920, while the sum is 31.

The square root of 715008721 is about 26739.6469871986. The cubic root of 715008721 is about 894.2050392446.

The spelling of 715008721 in words is "seven hundred fifteen million, eight thousand, seven hundred twenty-one".