726663686 has 16 divisors (see below), whose sum is σ = 1247756064. Its totient is φ = 310915584.

The previous prime is 726663649. The next prime is 726663689. The reversal of 726663686 is 686366627.

It is a super-2 number, since 2×726663686² = 1056080225102213192, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (726663689) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33755 + ... + 50918.

It is an arithmetic number, because the mean of its divisors is an integer number (77984754).

Almost surely, 2^726663686 is an apocalyptic number.

726663686 is a deficient number, since it is larger than the sum of its proper divisors (521092378).

726663686 is a wasteful number, since it uses less digits than its factorization.

726663686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85295.

The product of its digits is 2612736, while the sum is 50.

The square root of 726663686 is about 26956.7002060712. The cubic root of 726663686 is about 899.0375249895.

The spelling of 726663686 in words is "seven hundred twenty-six million, six hundred sixty-three thousand, six hundred eighty-six".