720896549 has 4 divisors (see below), whose sum is σ = 721028364. Its totient is φ = 720764736.

The previous prime is 720896503. The next prime is 720896551. The reversal of 720896549 is 945698027.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 945698027 = 53 ⋅17843359.

It can be written as a sum of positive squares in 2 ways, for example, as 345699649 + 375196900 = 18593^2 + 19370^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-720896549 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 720896497 and 720896506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720896569) 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, 57332 + ... + 68765.

It is an arithmetic number, because the mean of its divisors is an integer number (180257091).

Almost surely, 2^720896549 is an apocalyptic number.

It is an amenable number.

720896549 is a deficient number, since it is larger than the sum of its proper divisors (131815).

720896549 is a wasteful number, since it uses less digits than its factorization.

720896549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131814.

The product of its (nonzero) digits is 1088640, while the sum is 50.

The square root of 720896549 is about 26849.5167368055. The cubic root of 720896549 is about 896.6528134256.

The spelling of 720896549 in words is "seven hundred twenty million, eight hundred ninety-six thousand, five hundred forty-nine".