726621671 has 4 divisors (see below), whose sum is σ = 726677952. Its totient is φ = 726565392.

The previous prime is 726621661. The next prime is 726621673. The reversal of 726621671 is 176126627.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-726621671 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 (726621673) 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, 1955 + ... + 38171.

It is an arithmetic number, because the mean of its divisors is an integer number (181669488).

Almost surely, 2^726621671 is an apocalyptic number.

726621671 is a deficient number, since it is larger than the sum of its proper divisors (56281).

726621671 is a wasteful number, since it uses less digits than its factorization.

726621671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56280.

The product of its digits is 42336, while the sum is 38.

The square root of 726621671 is about 26955.9208894818. The cubic root of 726621671 is about 899.0201974920.

The spelling of 726621671 in words is "seven hundred twenty-six million, six hundred twenty-one thousand, six hundred seventy-one".