72145417 has 4 divisors (see below), whose sum is σ = 74633220. Its totient is φ = 69657616.

The previous prime is 72145397. The next prime is 72145427. The reversal of 72145417 is 71454127.

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

It can be written as a sum of positive squares in 2 ways, for example, as 18913801 + 53231616 = 4349^2 + 7296^2 .

It is a cyclic number.

It is not a de Polignac number, because 72145417 - 2⁷ = 72145289 is a prime.

It is a super-2 number, since 2×72145417² = 10409922388207778, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72145427) 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 3 ways as a sum of consecutive naturals, for example, 1243858 + ... + 1243915.

It is an arithmetic number, because the mean of its divisors is an integer number (18658305).

Almost surely, 2^72145417 is an apocalyptic number.

It is an amenable number.

72145417 is a deficient number, since it is larger than the sum of its proper divisors (2487803).

72145417 is a wasteful number, since it uses less digits than its factorization.

72145417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2487802.

The product of its digits is 7840, while the sum is 31.

The square root of 72145417 is about 8493.8458309531. The cubic root of 72145417 is about 416.2966499253.

The spelling of 72145417 in words is "seventy-two million, one hundred forty-five thousand, four hundred seventeen".