720224137 has 4 divisors (see below), whose sum is σ = 723995136. Its totient is φ = 716453140.

The previous prime is 720224123. The next prime is 720224143. The reversal of 720224137 is 731422027.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 731422027 = 7 ⋅104488861.

It is a cyclic number.

It is not a de Polignac number, because 720224137 - 2⁷ = 720224009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (720224177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1885213 + ... + 1885594.

It is an arithmetic number, because the mean of its divisors is an integer number (180998784).

Almost surely, 2^720224137 is an apocalyptic number.

It is an amenable number.

720224137 is a deficient number, since it is larger than the sum of its proper divisors (3770999).

720224137 is a wasteful number, since it uses less digits than its factorization.

720224137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3770998.

The product of its (nonzero) digits is 4704, while the sum is 28.

The square root of 720224137 is about 26836.9919514092. The cubic root of 720224137 is about 896.3739441637.

The spelling of 720224137 in words is "seven hundred twenty million, two hundred twenty-four thousand, one hundred thirty-seven".