722578409 has 8 divisors (see below), whose sum is σ = 827275200. Its totient is φ = 618249456.

The previous prime is 722578399. The next prime is 722578427. The reversal of 722578409 is 904875227.

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

It is a cyclic number.

It is not a de Polignac number, because 722578409 - 2⁴ = 722578393 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 722578409.

It is not an unprimeable number, because it can be changed into a prime (722578459) 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, 87734 + ... + 95615.

It is an arithmetic number, because the mean of its divisors is an integer number (103409400).

Almost surely, 2^722578409 is an apocalyptic number.

It is an amenable number.

722578409 is a deficient number, since it is larger than the sum of its proper divisors (104696791).

722578409 is a wasteful number, since it uses less digits than its factorization.

722578409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183919.

The product of its (nonzero) digits is 282240, while the sum is 44.

The square root of 722578409 is about 26880.8186073267. The cubic root of 722578409 is about 897.3495723243.

The spelling of 722578409 in words is "seven hundred twenty-two million, five hundred seventy-eight thousand, four hundred nine".