721342696 has 8 divisors (see below), whose sum is σ = 1352517570. Its totient is φ = 360671344.

The previous prime is 721342637. The next prime is 721342709. The reversal of 721342696 is 696243127.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 713424100 + 7918596 = 26710^2 + 2814^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45083911 + ... + 45083926.

Almost surely, 2^721342696 is an apocalyptic number.

It is an amenable number.

721342696 is a deficient number, since it is larger than the sum of its proper divisors (631174874).

721342696 is a wasteful number, since it uses less digits than its factorization.

721342696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90167843 (or 90167839 counting only the distinct ones).

The product of its digits is 108864, while the sum is 40.

The square root of 721342696 is about 26857.8237390895. The cubic root of 721342696 is about 896.8377481741.

The spelling of 721342696 in words is "seven hundred twenty-one million, three hundred forty-two thousand, six hundred ninety-six".