72198017 has 4 divisors (see below), whose sum is σ = 72218580. Its totient is φ = 72177456.

The previous prime is 72197999. The next prime is 72198029. The reversal of 72198017 is 71089127.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71089127 = 19 ⋅3741533.

It can be written as a sum of positive squares in 2 ways, for example, as 52475536 + 19722481 = 7244^2 + 4441^2 .

It is a cyclic number.

It is not a de Polignac number, because 72198017 - 2¹² = 72193921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72198067) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3542 + ... + 12527.

It is an arithmetic number, because the mean of its divisors is an integer number (18054645).

Almost surely, 2^72198017 is an apocalyptic number.

It is an amenable number.

72198017 is a deficient number, since it is larger than the sum of its proper divisors (20563).

72198017 is a wasteful number, since it uses less digits than its factorization.

72198017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20562.

The product of its (nonzero) digits is 7056, while the sum is 35.

The square root of 72198017 is about 8496.9416262559. The cubic root of 72198017 is about 416.3977969569.

The spelling of 72198017 in words is "seventy-two million, one hundred ninety-eight thousand, seventeen".