708725721 has 16 divisors (see below), whose sum is σ = 1032378048. Its totient is φ = 428904000.

The previous prime is 708725671. The next prime is 708725777. The reversal of 708725721 is 127527807.

It is not a de Polignac number, because 708725721 - 2²¹ = 706628569 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 708725721.

It is not an unprimeable number, because it can be changed into a prime (708725021) 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 15 ways as a sum of consecutive naturals, for example, 7815 + ... + 38451.

It is an arithmetic number, because the mean of its divisors is an integer number (64523628).

Almost surely, 2^708725721 is an apocalyptic number.

It is an amenable number.

708725721 is a deficient number, since it is larger than the sum of its proper divisors (323652327).

708725721 is a wasteful number, since it uses less digits than its factorization.

708725721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31352.

The product of its (nonzero) digits is 54880, while the sum is 39.

The square root of 708725721 is about 26621.9030311509. The cubic root of 708725721 is about 891.5781120235.

The spelling of 708725721 in words is "seven hundred eight million, seven hundred twenty-five thousand, seven hundred twenty-one".