73072145 has 8 divisors (see below), whose sum is σ = 87732456. Its totient is φ = 58427136.

The previous prime is 73072123. The next prime is 73072159. The reversal of 73072145 is 54127037.

It can be written as a sum of positive squares in 4 ways, for example, as 16386304 + 56685841 = 4048^2 + 7529^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 73072145 - 2¹⁰ = 73071121 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17039 + ... + 20891.

It is an arithmetic number, because the mean of its divisors is an integer number (10966557).

Almost surely, 2^73072145 is an apocalyptic number.

It is an amenable number.

73072145 is a deficient number, since it is larger than the sum of its proper divisors (14660311).

73072145 is a wasteful number, since it uses less digits than its factorization.

73072145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7651.

The product of its (nonzero) digits is 5880, while the sum is 29.

The square root of 73072145 is about 8548.2246694855. The cubic root of 73072145 is about 418.0715539540.

The spelling of 73072145 in words is "seventy-three million, seventy-two thousand, one hundred forty-five".