720994 has 4 divisors (see below), whose sum is σ = 1081494. Its totient is φ = 360496.

The previous prime is 720991. The next prime is 720997. The reversal of 720994 is 499027.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (720991) and next prime (720997).

It can be written as a sum of positive squares in only one way, i.e., 660969 + 60025 = 813^2 + 245^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (720991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 180247 + ... + 180250.

2⁷²⁰⁹⁹⁴ is an apocalyptic number.

720994 is a deficient number, since it is larger than the sum of its proper divisors (360500).

720994 is a wasteful number, since it uses less digits than its factorization.

720994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360499.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 720994 is about 849.1136555256. The cubic root of 720994 is about 89.6693214866.

The spelling of 720994 in words is "seven hundred twenty thousand, nine hundred ninety-four".