720342031 has 4 divisors (see below), whose sum is σ = 722194200. Its totient is φ = 718489864.

The previous prime is 720342023. The next prime is 720342067. The reversal of 720342031 is 130243027.

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

It is a cyclic number.

It is not a de Polignac number, because 720342031 - 2³ = 720342023 is a prime.

It is a super-2 number, since 2×720342031² = 1037785283250409922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 720341993 and 720342011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720342001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 925501 + ... + 926278.

It is an arithmetic number, because the mean of its divisors is an integer number (180548550).

Almost surely, 2^720342031 is an apocalyptic number.

720342031 is a deficient number, since it is larger than the sum of its proper divisors (1852169).

720342031 is a wasteful number, since it uses less digits than its factorization.

720342031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1852168.

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 720342031 is about 26839.1883446575. The cubic root of 720342031 is about 896.4228508576.

Adding to 720342031 its reverse (130243027), we get a palindrome (850585058).

The spelling of 720342031 in words is "seven hundred twenty million, three hundred forty-two thousand, thirty-one".