726386644 has 24 divisors (see below), whose sum is σ = 1396261440. Its totient is φ = 329117184.

The previous prime is 726386629. The next prime is 726386653. The reversal of 726386644 is 446683627.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a junction number, because it is equal to n+sod(n) for n = 726386594 and 726386603.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 206029 + ... + 209524.

It is an arithmetic number, because the mean of its divisors is an integer number (58177560).

Almost surely, 2^726386644 is an apocalyptic number.

It is an amenable number.

726386644 is a deficient number, since it is larger than the sum of its proper divisors (669874796).

726386644 is a wasteful number, since it uses less digits than its factorization.

726386644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415599 (or 415597 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 46.

The square root of 726386644 is about 26951.5610679604. The cubic root of 726386644 is about 898.9232571751.

The spelling of 726386644 in words is "seven hundred twenty-six million, three hundred eighty-six thousand, six hundred forty-four".