73156945 has 8 divisors (see below), whose sum is σ = 88102440. Its totient is φ = 58316160.

The previous prime is 73156939. The next prime is 73156949. The reversal of 73156945 is 54965137.

It can be written as a sum of positive squares in 4 ways, for example, as 25877569 + 47279376 = 5087^2 + 6876^2 .

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

It is not a de Polignac number, because 73156945 - 2⁵ = 73156913 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 73156898 and 73156907.

It is not an unprimeable number, because it can be changed into a prime (73156949) 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 7 ways as a sum of consecutive naturals, for example, 24630 + ... + 27439.

It is an arithmetic number, because the mean of its divisors is an integer number (11012805).

Almost surely, 2^73156945 is an apocalyptic number.

It is an amenable number.

73156945 is a deficient number, since it is larger than the sum of its proper divisors (14945495).

73156945 is a wasteful number, since it uses less digits than its factorization.

73156945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52355.

The product of its digits is 113400, while the sum is 40.

The square root of 73156945 is about 8553.1833255227. The cubic root of 73156945 is about 418.2332150195.

The spelling of 73156945 in words is "seventy-three million, one hundred fifty-six thousand, nine hundred forty-five".