72198709 has 4 divisors (see below), whose sum is σ = 78762240. Its totient is φ = 65635180.

The previous prime is 72198701. The next prime is 72198733. The reversal of 72198709 is 90789127.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 72198709 - 2³ = 72198701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72198701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3281749 + ... + 3281770.

It is an arithmetic number, because the mean of its divisors is an integer number (19690560).

Almost surely, 2^72198709 is an apocalyptic number.

It is an amenable number.

72198709 is a deficient number, since it is larger than the sum of its proper divisors (6563531).

72198709 is a wasteful number, since it uses less digits than its factorization.

72198709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6563530.

The product of its (nonzero) digits is 63504, while the sum is 43.

The square root of 72198709 is about 8496.9823466923. The cubic root of 72198709 is about 416.3991273090.

The spelling of 72198709 in words is "seventy-two million, one hundred ninety-eight thousand, seven hundred nine".