721370115 has 24 divisors (see below), whose sum is σ = 1255625280. Its totient is φ = 383115264.

The previous prime is 721370063. The next prime is 721370123. The reversal of 721370115 is 511073127.

It is a happy number.

It is not a de Polignac number, because 721370115 - 2¹⁵ = 721337347 is a prime.

It is a super-2 number, since 2×721370115² = 1040749685630226450, which contains 22 as substring.

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 in 23 ways as a sum of consecutive naturals, for example, 22782 + ... + 44291.

It is an arithmetic number, because the mean of its divisors is an integer number (52317720).

Almost surely, 2^721370115 is an apocalyptic number.

721370115 is a deficient number, since it is larger than the sum of its proper divisors (534255165).

721370115 is a wasteful number, since it uses less digits than its factorization.

721370115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67323 (or 67320 counting only the distinct ones).

The product of its (nonzero) digits is 1470, while the sum is 27.

The square root of 721370115 is about 26858.3341814045. The cubic root of 721370115 is about 896.8491112811.

The spelling of 721370115 in words is "seven hundred twenty-one million, three hundred seventy thousand, one hundred fifteen".