720649715 has 8 divisors (see below), whose sum is σ = 892675968. Its totient is φ = 557922240.

The previous prime is 720649711. The next prime is 720649723. The reversal of 720649715 is 517946027.

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

It is not a de Polignac number, because 720649715 - 2² = 720649711 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (720649711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2324522 + ... + 2324831.

It is an arithmetic number, because the mean of its divisors is an integer number (111584496).

Almost surely, 2^720649715 is an apocalyptic number.

720649715 is a deficient number, since it is larger than the sum of its proper divisors (172026253).

720649715 is a wasteful number, since it uses less digits than its factorization.

720649715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4649389.

The product of its (nonzero) digits is 105840, while the sum is 41.

The square root of 720649715 is about 26844.9197242234. The cubic root of 720649715 is about 896.5504641745.

The spelling of 720649715 in words is "seven hundred twenty million, six hundred forty-nine thousand, seven hundred fifteen".