720578623 has 4 divisors (see below), whose sum is σ = 732791880. Its totient is φ = 708365368.

The previous prime is 720578611. The next prime is 720578647. The reversal of 720578623 is 326875027.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 326875027 = 61 ⋅5358607.

It is a cyclic number.

It is not a de Polignac number, because 720578623 - 2²¹ = 718481471 is a prime.

It is a super-2 number, since 2×720578623² = 1038467103849152258, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720578323) 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 3 ways as a sum of consecutive naturals, for example, 6106540 + ... + 6106657.

It is an arithmetic number, because the mean of its divisors is an integer number (183197970).

Almost surely, 2^720578623 is an apocalyptic number.

720578623 is a deficient number, since it is larger than the sum of its proper divisors (12213257).

720578623 is a wasteful number, since it uses less digits than its factorization.

720578623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12213256.

The product of its (nonzero) digits is 141120, while the sum is 40.

The square root of 720578623 is about 26843.5955676582. The cubic root of 720578623 is about 896.5209816764.

The spelling of 720578623 in words is "seven hundred twenty million, five hundred seventy-eight thousand, six hundred twenty-three".