726628 has 12 divisors (see below), whose sum is σ = 1453312. Its totient is φ = 311400.

The previous prime is 726623. The next prime is 726629. The reversal of 726628 is 826627.

It is a happy number.

726628 is an admirable number.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 726628.

It is not an unprimeable number, because it can be changed into a prime (726623) by changing a digit.

726628 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12948 + ... + 13003.

2⁷²⁶⁶²⁸ is an apocalyptic number.

It is an amenable number.

726628 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

726628 is a wasteful number, since it uses less digits than its factorization.

726628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25962 (or 25960 counting only the distinct ones).

The product of its digits is 8064, while the sum is 31.

The square root of 726628 is about 852.4247767399. The cubic root of 726628 is about 89.9022807691.

Subtracting 726628 from its reverse (826627), we obtain a palindrome (99999).

The spelling of 726628 in words is "seven hundred twenty-six thousand, six hundred twenty-eight".