721378995 has 16 divisors (see below), whose sum is σ = 1160191392. Its totient is φ = 382740480.

The previous prime is 721378967. The next prime is 721378997. The reversal of 721378995 is 599873127.

It is not a de Polignac number, because 721378995 - 2¹⁰ = 721377971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (721378997) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121696 + ... + 127485.

It is an arithmetic number, because the mean of its divisors is an integer number (72511962).

Almost surely, 2^721378995 is an apocalyptic number.

721378995 is a deficient number, since it is larger than the sum of its proper divisors (438812397).

721378995 is a wasteful number, since it uses less digits than its factorization.

721378995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249382.

The product of its digits is 952560, while the sum is 51.

The square root of 721378995 is about 26858.4994927118. The cubic root of 721378995 is about 896.8527913095.

The spelling of 721378995 in words is "seven hundred twenty-one million, three hundred seventy-eight thousand, nine hundred ninety-five".