726704821 has 4 divisors (see below), whose sum is σ = 750146944. Its totient is φ = 703262700.

The previous prime is 726704819. The next prime is 726704843. The reversal of 726704821 is 128407627.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 726704821 - 2¹ = 726704819 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (726704851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11721015 + ... + 11721076.

It is an arithmetic number, because the mean of its divisors is an integer number (187536736).

Almost surely, 2^726704821 is an apocalyptic number.

It is an amenable number.

726704821 is a deficient number, since it is larger than the sum of its proper divisors (23442123).

726704821 is a wasteful number, since it uses less digits than its factorization.

726704821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23442122.

The product of its (nonzero) digits is 37632, while the sum is 37.

The square root of 726704821 is about 26957.4631781256. The cubic root of 726704821 is about 899.0544889173.

The spelling of 726704821 in words is "seven hundred twenty-six million, seven hundred four thousand, eight hundred twenty-one".