720285749 has 4 divisors (see below), whose sum is σ = 721000620. Its totient is φ = 719570880.

The previous prime is 720285737. The next prime is 720285757. The reversal of 720285749 is 947582027.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 265103524 + 455182225 = 16282^2 + 21335^2 .

It is a cyclic number.

It is not a de Polignac number, because 720285749 - 2⁸ = 720285493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720285799) 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, 355922 + ... + 357939.

It is an arithmetic number, because the mean of its divisors is an integer number (180250155).

Almost surely, 2^720285749 is an apocalyptic number.

It is an amenable number.

720285749 is a deficient number, since it is larger than the sum of its proper divisors (714871).

720285749 is a wasteful number, since it uses less digits than its factorization.

720285749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 714870.

The product of its (nonzero) digits is 282240, while the sum is 44.

The square root of 720285749 is about 26838.1398200397. The cubic root of 720285749 is about 896.3995037148.

It can be divided in two parts, 72028 and 5749, that added together give a palindrome (77777).

The spelling of 720285749 in words is "seven hundred twenty million, two hundred eighty-five thousand, seven hundred forty-nine".