72170001 has 16 divisors (see below), whose sum is σ = 107092800. Its totient is φ = 48034944.

The previous prime is 72169987. The next prime is 72170029. The reversal of 72170001 is 10007127.

It is not a de Polignac number, because 72170001 - 2²⁶ = 5061137 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (72170041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18145 + ... + 21761.

It is an arithmetic number, because the mean of its divisors is an integer number (6693300).

Almost surely, 2^72170001 is an apocalyptic number.

It is an amenable number.

72170001 is a deficient number, since it is larger than the sum of its proper divisors (34922799).

72170001 is a wasteful number, since it uses less digits than its factorization.

72170001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4365 (or 4359 counting only the distinct ones).

The product of its (nonzero) digits is 98, while the sum is 18.

The square root of 72170001 is about 8495.2928731151. The cubic root of 72170001 is about 416.3439297805.

Adding to 72170001 its reverse (10007127), we get a palindrome (82177128).

The spelling of 72170001 in words is "seventy-two million, one hundred seventy thousand, one".