726615 has 24 divisors (see below), whose sum is σ = 1283568. Its totient is φ = 380160.

The previous prime is 726611. The next prime is 726619. The reversal of 726615 is 516627.

726615 is a nontrivial binomial coefficient, being equal to C(1206, 2).

It is an interprime number because it is at equal distance from previous prime (726611) and next prime (726619).

It is not a de Polignac number, because 726615 - 2² = 726611 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (726611) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 2895 + ... + 3135.

It is an arithmetic number, because the mean of its divisors is an integer number (53482).

2⁷²⁶⁶¹⁵ is an apocalyptic number.

726615 is the 1205-th triangular number and also the 603-rd hexagonal number.

726615 is a deficient number, since it is larger than the sum of its proper divisors (556953).

726615 is a wasteful number, since it uses less digits than its factorization.

726615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319 (or 316 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 726615 is about 852.4171513995. The cubic root of 726615 is about 89.9017446229.

The spelling of 726615 in words is "seven hundred twenty-six thousand, six hundred fifteen".