715630721 has 4 divisors (see below), whose sum is σ = 770679252. Its totient is φ = 660582192.

The previous prime is 715630703. The next prime is 715630733. The reversal of 715630721 is 127036517.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 127036517 = 4409 ⋅28813.

It can be written as a sum of positive squares in 2 ways, for example, as 459630721 + 256000000 = 21439^2 + 16000^2 .

It is a cyclic number.

It is not a de Polignac number, because 715630721 - 2¹⁰ = 715629697 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (715630781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27524246 + ... + 27524271.

It is an arithmetic number, because the mean of its divisors is an integer number (192669813).

Almost surely, 2^715630721 is an apocalyptic number.

It is an amenable number.

715630721 is a deficient number, since it is larger than the sum of its proper divisors (55048531).

715630721 is a wasteful number, since it uses less digits than its factorization.

715630721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55048530.

The product of its (nonzero) digits is 8820, while the sum is 32.

The square root of 715630721 is about 26751.2751284869. The cubic root of 715630721 is about 894.4642595470.

The spelling of 715630721 in words is "seven hundred fifteen million, six hundred thirty thousand, seven hundred twenty-one".