720682989 has 64 divisors (see below), whose sum is σ = 1154248704. Its totient is φ = 395467776.

The previous prime is 720682987. The next prime is 720682993. The reversal of 720682989 is 989286027.

It is a happy number.

It is not a de Polignac number, because 720682989 - 2¹ = 720682987 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720682987) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2546442 + ... + 2546724.

It is an arithmetic number, because the mean of its divisors is an integer number (18035136).

Almost surely, 2^720682989 is an apocalyptic number.

It is an amenable number.

720682989 is a deficient number, since it is larger than the sum of its proper divisors (433565715).

720682989 is a wasteful number, since it uses less digits than its factorization.

720682989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506.

The product of its (nonzero) digits is 870912, while the sum is 51.

The square root of 720682989 is about 26845.5394618920. The cubic root of 720682989 is about 896.5642625384.

It can be divided in two parts, 72068 and 2989, that added together give a palindrome (75057).

The spelling of 720682989 in words is "seven hundred twenty million, six hundred eighty-two thousand, nine hundred eighty-nine".