726651 has 10 divisors (see below), whose sum is σ = 1085612. Its totient is φ = 484380.

The previous prime is 726647. The next prime is 726659. The reversal of 726651 is 156627.

726651 is a `hidden beast` number, since 7 + 2 + 6 + 651 = 666.

It is not a de Polignac number, because 726651 - 2² = 726647 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (726659) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 4405 + ... + 4566.

2⁷²⁶⁶⁵¹ is an apocalyptic number.

726651 is a deficient number, since it is larger than the sum of its proper divisors (358961).

726651 is an equidigital number, since it uses as much as digits as its factorization.

726651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8983 (or 8974 counting only the distinct ones).

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

The square root of 726651 is about 852.4382675596. The cubic root of 726651 is about 89.9032293199.

The spelling of 726651 in words is "seven hundred twenty-six thousand, six hundred fifty-one".