72070171 has 4 divisors (see below), whose sum is σ = 72743832. Its totient is φ = 71396512.

The previous prime is 72070151. The next prime is 72070177. The reversal of 72070171 is 17107027.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72070171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72070177) 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, 336670 + ... + 336883.

It is an arithmetic number, because the mean of its divisors is an integer number (18185958).

Almost surely, 2^72070171 is an apocalyptic number.

72070171 is a deficient number, since it is larger than the sum of its proper divisors (673661).

72070171 is a wasteful number, since it uses less digits than its factorization.

72070171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 673660.

The product of its (nonzero) digits is 686, while the sum is 25.

The square root of 72070171 is about 8489.4152331006. The cubic root of 72070171 is about 416.1518703231.

Adding to 72070171 its reverse (17107027), we get a palindrome (89177198).

The spelling of 72070171 in words is "seventy-two million, seventy thousand, one hundred seventy-one".