720347746 has 8 divisors (see below), whose sum is σ = 1109725020. Its totient is φ = 350439408.

The previous prime is 720347743. The next prime is 720347759. The reversal of 720347746 is 647743027.

It can be written as a sum of positive squares in 2 ways, for example, as 705486721 + 14861025 = 26561^2 + 3855^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 720347699 and 720347708.

It is not an unprimeable number, because it can be changed into a prime (720347743) 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, 4867141 + ... + 4867288.

Almost surely, 2^720347746 is an apocalyptic number.

720347746 is a deficient number, since it is larger than the sum of its proper divisors (389377274).

720347746 is a wasteful number, since it uses less digits than its factorization.

720347746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9734468.

The product of its (nonzero) digits is 197568, while the sum is 40.

The square root of 720347746 is about 26839.2948118985. The cubic root of 720347746 is about 896.4252215106.

The spelling of 720347746 in words is "seven hundred twenty million, three hundred forty-seven thousand, seven hundred forty-six".