721963105 has 16 divisors (see below), whose sum is σ = 879402960. Its totient is φ = 568922112.

The previous prime is 721963093. The next prime is 721963111. The reversal of 721963105 is 501369127.

It can be written as a sum of positive squares in 8 ways, for example, as 14190289 + 707772816 = 3767^2 + 26604^2 .

It is a cyclic number.

It is not a de Polignac number, because 721963105 - 2²¹ = 719865953 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 120337 + ... + 126193.

It is an arithmetic number, because the mean of its divisors is an integer number (54962685).

Almost surely, 2^721963105 is an apocalyptic number.

It is an amenable number.

721963105 is a deficient number, since it is larger than the sum of its proper divisors (157439855).

721963105 is a wasteful number, since it uses less digits than its factorization.

721963105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6228.

The product of its (nonzero) digits is 11340, while the sum is 34.

The square root of 721963105 is about 26869.3711314575. The cubic root of 721963105 is about 897.0947904800.

The spelling of 721963105 in words is "seven hundred twenty-one million, nine hundred sixty-three thousand, one hundred five".