726641685 has 128 divisors (see below), whose sum is σ = 1632337920. Its totient is φ = 301631040.

The previous prime is 726641639. The next prime is 726641711. The reversal of 726641685 is 586146627.

It is not a de Polignac number, because 726641685 - 2⁶ = 726641621 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 726641685.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 841564 + ... + 842426.

It is an arithmetic number, because the mean of its divisors is an integer number (12752640).

Almost surely, 2^726641685 is an apocalyptic number.

It is an amenable number.

726641685 is an abundant number, since it is smaller than the sum of its proper divisors (905696235).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

726641685 is an equidigital number, since it uses as much as digits as its factorization.

726641685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 907 (or 889 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The square root of 726641685 is about 26956.2921226195. The cubic root of 726641685 is about 899.0284515926.

It can be divided in two parts, 726 and 641685, that added together give a triangular number (642411 = T₁₁₃₃).

The spelling of 726641685 in words is "seven hundred twenty-six million, six hundred forty-one thousand, six hundred eighty-five".