720838994 has 4 divisors (see below), whose sum is σ = 1081258494. Its totient is φ = 360419496.

The previous prime is 720838973. The next prime is 720839003. The reversal of 720838994 is 499838027.

It is a happy number.

720838994 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 404532769 + 316306225 = 20113^2 + 17785^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 180209747 + ... + 180209750.

Almost surely, 2^720838994 is an apocalyptic number.

720838994 is a deficient number, since it is larger than the sum of its proper divisors (360419500).

720838994 is a wasteful number, since it uses less digits than its factorization.

720838994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360419499.

The product of its (nonzero) digits is 870912, while the sum is 50.

The square root of 720838994 is about 26848.4449084114. Note that the first 3 decimals coincide. The cubic root of 720838994 is about 896.6289504427.

The spelling of 720838994 in words is "seven hundred twenty million, eight hundred thirty-eight thousand, nine hundred ninety-four".