724656145 has 4 divisors (see below), whose sum is σ = 869587380. Its totient is φ = 579724912.

The previous prime is 724656139. The next prime is 724656169. The reversal of 724656145 is 541656427.

It is a happy number.

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 214212496 + 510443649 = 14636^2 + 22593^2 .

It is a cyclic number.

It is not a de Polignac number, because 724656145 - 2¹¹ = 724654097 is a prime.

It is a super-2 number, since 2×724656145² = 1050253056972522050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 724656098 and 724656107.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72465610 + ... + 72465619.

It is an arithmetic number, because the mean of its divisors is an integer number (217396845).

Almost surely, 2^724656145 is an apocalyptic number.

It is an amenable number.

724656145 is a deficient number, since it is larger than the sum of its proper divisors (144931235).

724656145 is a wasteful number, since it uses less digits than its factorization.

724656145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144931234.

The product of its digits is 201600, while the sum is 40.

The square root of 724656145 is about 26919.4380513413. The cubic root of 724656145 is about 898.2088429997.

The spelling of 724656145 in words is "seven hundred twenty-four million, six hundred fifty-six thousand, one hundred forty-five".