721609094 has 8 divisors (see below), whose sum is σ = 1139382840. Its totient is φ = 341814816.

The previous prime is 721609087. The next prime is 721609121. The reversal of 721609094 is 490906127.

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

It is a Harshad number since it is a multiple of its sum of digits (38), and also a Moran number because the ratio is a prime number: 18989713 = 721609094 / (7 + 2 + 1 + 6 + 0 + 9 + 0 + 9 + 4).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9494819 + ... + 9494894.

It is an arithmetic number, because the mean of its divisors is an integer number (142422855).

Almost surely, 2^721609094 is an apocalyptic number.

721609094 is a deficient number, since it is larger than the sum of its proper divisors (417773746).

721609094 is a wasteful number, since it uses less digits than its factorization.

721609094 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18989734.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 721609094 is about 26862.7826927889. The cubic root of 721609094 is about 896.9481378583.

The spelling of 721609094 in words is "seven hundred twenty-one million, six hundred nine thousand, ninety-four".