721064393 has 8 divisors (see below), whose sum is σ = 824311488. Its totient is φ = 617876784.

The previous prime is 721064359. The next prime is 721064423. The reversal of 721064393 is 393460127.

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

It is not a de Polignac number, because 721064393 - 2¹⁶ = 720998857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (721064303) 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, 15155 + ... + 40887.

It is an arithmetic number, because the mean of its divisors is an integer number (103038936).

Almost surely, 2^721064393 is an apocalyptic number.

It is an amenable number.

721064393 is a deficient number, since it is larger than the sum of its proper divisors (103247095).

721064393 is a wasteful number, since it uses less digits than its factorization.

721064393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29743.

The product of its (nonzero) digits is 27216, while the sum is 35.

The square root of 721064393 is about 26852.6421977429. The cubic root of 721064393 is about 896.7223962789.

The spelling of 721064393 in words is "seven hundred twenty-one million, sixty-four thousand, three hundred ninety-three".