721018458 has 12 divisors (see below), whose sum is σ = 1562206698. Its totient is φ = 240339480.

The previous prime is 721018411. The next prime is 721018469. The reversal of 721018458 is 854810127.

It can be written as a sum of positive squares in only one way, i.e., 720761409 + 257049 = 26847^2 + 507^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20028273 + ... + 20028308.

Almost surely, 2^721018458 is an apocalyptic number.

721018458 is an abundant number, since it is smaller than the sum of its proper divisors (841188240).

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

721018458 is a wasteful number, since it uses less digits than its factorization.

721018458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40056589 (or 40056586 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 36.

The square root of 721018458 is about 26851.7868679163. The cubic root of 721018458 is about 896.7033541432.

The spelling of 721018458 in words is "seven hundred twenty-one million, eighteen thousand, four hundred fifty-eight".