721723746 has 24 divisors (see below), whose sum is σ = 1533354480. Its totient is φ = 226422592.

The previous prime is 721723703. The next prime is 721723817. The reversal of 721723746 is 647327127.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 206376 + ... + 209843.

It is an arithmetic number, because the mean of its divisors is an integer number (63889770).

Almost surely, 2^721723746 is an apocalyptic number.

721723746 is an abundant number, since it is smaller than the sum of its proper divisors (811630734).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

721723746 is a wasteful number, since it uses less digits than its factorization.

721723746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416258 (or 416241 counting only the distinct ones).

The product of its digits is 98784, while the sum is 39.

The square root of 721723746 is about 26864.9166386200. The cubic root of 721723746 is about 896.9956388543.

The spelling of 721723746 in words is "seven hundred twenty-one million, seven hundred twenty-three thousand, seven hundred forty-six".