73156729 has 4 divisors (see below), whose sum is σ = 77460084. Its totient is φ = 68853376.

The previous prime is 73156703. The next prime is 73156753. The reversal of 73156729 is 92765137.

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 28601104 + 44555625 = 5348^2 + 6675^2 .

It is a cyclic number.

It is not a de Polignac number, because 73156729 - 2⁹ = 73156217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 73156691 and 73156700.

It is not an unprimeable number, because it can be changed into a prime (73156789) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2151652 + ... + 2151685.

It is an arithmetic number, because the mean of its divisors is an integer number (19365021).

Almost surely, 2^73156729 is an apocalyptic number.

It is an amenable number.

73156729 is a deficient number, since it is larger than the sum of its proper divisors (4303355).

73156729 is a wasteful number, since it uses less digits than its factorization.

73156729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4303354.

The product of its digits is 79380, while the sum is 40.

The square root of 73156729 is about 8553.1706986357. The cubic root of 73156729 is about 418.2328034001.

The spelling of 73156729 in words is "seventy-three million, one hundred fifty-six thousand, seven hundred twenty-nine".