721642413 has 8 divisors (see below), whose sum is σ = 988195168. Its totient is φ = 468092304.

The previous prime is 721642403. The next prime is 721642417. The reversal of 721642413 is 314246127.

721642413 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 721642413 - 2⁵ = 721642381 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 (721642417) 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, 3250531 + ... + 3250752.

It is an arithmetic number, because the mean of its divisors is an integer number (123524396).

Almost surely, 2^721642413 is an apocalyptic number.

It is an amenable number.

721642413 is a deficient number, since it is larger than the sum of its proper divisors (266552755).

721642413 is a wasteful number, since it uses less digits than its factorization.

721642413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6501323.

The product of its digits is 8064, while the sum is 30.

The square root of 721642413 is about 26863.4028559302. The cubic root of 721642413 is about 896.9619426340.

The spelling of 721642413 in words is "seven hundred twenty-one million, six hundred forty-two thousand, four hundred thirteen".