72197997 has 8 divisors (see below), whose sum is σ = 101926656. Its totient is φ = 45300672.

The previous prime is 72197981. The next prime is 72197999. The reversal of 72197997 is 79979127.

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

It is not a de Polignac number, because 72197997 - 2⁴ = 72197981 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51), and also a Moran number because the ratio is a prime number: 1415647 = 72197997 / (7 + 2 + 1 + 9 + 7 + 9 + 9 + 7).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72197999) 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, 707773 + ... + 707874.

It is an arithmetic number, because the mean of its divisors is an integer number (12740832).

Almost surely, 2^72197997 is an apocalyptic number.

It is an amenable number.

72197997 is a deficient number, since it is larger than the sum of its proper divisors (29728659).

72197997 is a wasteful number, since it uses less digits than its factorization.

72197997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1415667.

The product of its digits is 500094, while the sum is 51.

The square root of 72197997 is about 8496.9404493618. The cubic root of 72197997 is about 416.3977585073.

The spelling of 72197997 in words is "seventy-two million, one hundred ninety-seven thousand, nine hundred ninety-seven".