721641107 has 8 divisors (see below), whose sum is σ = 788272560. Its totient is φ = 655180960.

The previous prime is 721641101. The next prime is 721641113. The reversal of 721641107 is 701146127.

721641107 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (721641101) and next prime (721641113).

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

It is a cyclic number.

It is not a de Polignac number, because 721641107 - 2⁸ = 721640851 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 721641107.

It is not an unprimeable number, because it can be changed into a prime (721641101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33932 + ... + 50937.

It is an arithmetic number, because the mean of its divisors is an integer number (98534070).

Almost surely, 2^721641107 is an apocalyptic number.

721641107 is a deficient number, since it is larger than the sum of its proper divisors (66631453).

721641107 is a wasteful number, since it uses less digits than its factorization.

721641107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85653.

The product of its (nonzero) digits is 2352, while the sum is 29.

The square root of 721641107 is about 26863.3785477553. The cubic root of 721641107 is about 896.9614015383.

The spelling of 721641107 in words is "seven hundred twenty-one million, six hundred forty-one thousand, one hundred seven".