720423442 has 4 divisors (see below), whose sum is σ = 1080635166. Its totient is φ = 360211720.

The previous prime is 720423421. The next prime is 720423449. The reversal of 720423442 is 244324027.

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

It can be written as a sum of positive squares in only one way, i.e., 662496121 + 57927321 = 25739^2 + 7611^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 720423442.

It is not an unprimeable number, because it can be changed into a prime (720423449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 180105859 + ... + 180105862.

Almost surely, 2^720423442 is an apocalyptic number.

720423442 is a deficient number, since it is larger than the sum of its proper divisors (360211724).

720423442 is a wasteful number, since it uses less digits than its factorization.

720423442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360211723.

The product of its (nonzero) digits is 10752, while the sum is 28.

The square root of 720423442 is about 26840.7049460330. The cubic root of 720423442 is about 896.4566199694.

Adding to 720423442 its reverse (244324027), we get a palindrome (964747469).

The spelling of 720423442 in words is "seven hundred twenty million, four hundred twenty-three thousand, four hundred forty-two".