721327105 has 8 divisors (see below), whose sum is σ = 867257064. Its totient is φ = 575952000.

The previous prime is 721327093. The next prime is 721327129. The reversal of 721327105 is 501723127.

It can be written as a sum of positive squares in 4 ways, for example, as 213861376 + 507465729 = 14624^2 + 22527^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 721327105 - 2⁵ = 721327073 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135846 + ... + 141055.

It is an arithmetic number, because the mean of its divisors is an integer number (108407133).

Almost surely, 2^721327105 is an apocalyptic number.

It is an amenable number.

721327105 is a deficient number, since it is larger than the sum of its proper divisors (145929959).

721327105 is a wasteful number, since it uses less digits than its factorization.

721327105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277427.

The product of its (nonzero) digits is 2940, while the sum is 28.

The square root of 721327105 is about 26857.5334869008. The cubic root of 721327105 is about 896.8312867524.

The spelling of 721327105 in words is "seven hundred twenty-one million, three hundred twenty-seven thousand, one hundred five".