720435623 has 2 divisors, whose sum is σ = 720435624. Its totient is φ = 720435622.

The previous prime is 720435593. The next prime is 720435659. The reversal of 720435623 is 326534027.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 720435623 - 2¹² = 720431527 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 720435623.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (720438623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360217811 + 360217812.

It is an arithmetic number, because the mean of its divisors is an integer number (360217812).

Almost surely, 2^720435623 is an apocalyptic number.

720435623 is a deficient number, since it is larger than the sum of its proper divisors (1).

720435623 is an equidigital number, since it uses as much as digits as its factorization.

720435623 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 32.

The square root of 720435623 is about 26840.9318578920. The cubic root of 720435623 is about 896.4616724038.

The spelling of 720435623 in words is "seven hundred twenty million, four hundred thirty-five thousand, six hundred twenty-three".