721416015 has 12 divisors (see below), whose sum is σ = 1250454504. Its totient is φ = 384755184.

The previous prime is 721416013. The next prime is 721416037. The reversal of 721416015 is 510614127.

It is a happy number.

It is not a de Polignac number, because 721416015 - 2¹ = 721416013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 721416015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721416011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8015689 + ... + 8015778.

It is an arithmetic number, because the mean of its divisors is an integer number (104204542).

Almost surely, 2^721416015 is an apocalyptic number.

721416015 is a deficient number, since it is larger than the sum of its proper divisors (529038489).

721416015 is a wasteful number, since it uses less digits than its factorization.

721416015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16031478 (or 16031475 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 721416015 is about 26859.1886511860. The cubic root of 721416015 is about 896.8681327239.

The spelling of 721416015 in words is "seven hundred twenty-one million, four hundred sixteen thousand, fifteen".