721000455 has 48 divisors (see below), whose sum is σ = 1353975264. Its totient is φ = 326645760.

The previous prime is 721000453. The next prime is 721000507. The reversal of 721000455 is 554000127.

721000455 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 721000455 - 2¹ = 721000453 is a prime.

It is a super-2 number, since 2×721000455² = 1039683312220414050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721000451) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 78715 + ... + 87395.

It is an arithmetic number, because the mean of its divisors is an integer number (28207818).

Almost surely, 2^721000455 is an apocalyptic number.

721000455 is a deficient number, since it is larger than the sum of its proper divisors (632974809).

721000455 is a wasteful number, since it uses less digits than its factorization.

721000455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8816 (or 8809 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 24.

The square root of 721000455 is about 26851.4516367365. The cubic root of 721000455 is about 896.6958908646.

The spelling of 721000455 in words is "seven hundred twenty-one million, four hundred fifty-five", and thus it is an aban number.