71673156 has 81 divisors (see below), whose sum is σ = 194804701. Its totient is φ = 22214784.

The previous prime is 71673137. The next prime is 71673163. The reversal of 71673156 is 65137617.

The square root of 71673156 is 8466.

It is a perfect power (a square), and thus also a powerful number.

71673156 is nontrivially palindromic in base 16.

It can be written as a sum of positive squares in only one way, i.e., 55800900 + 15872256 = 7470^2 + 3984^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a Duffinian number.

Its product of digits (26460) is a multiple of the sum of its prime divisors (105).

It is a self number, because there is not a number n which added to its sum of digits gives 71673156.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 863491 + ... + 863573.

Almost surely, 2^71673156 is an apocalyptic number.

71673156 is the 8466-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71673156

71673156 is an abundant number, since it is smaller than the sum of its proper divisors (123131545).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71673156 is a wasteful number, since it uses less digits than its factorization.

71673156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210 (or 105 counting only the distinct ones).

The product of its digits is 26460, while the sum is 36.

The cubic root of 71673156 is about 415.3863069573.

Multiplying 71673156 by its sum of digits (36), we get a square (2580233616 = 50796²).

71673156 divided by its sum of digits (36) gives a square (1990921 = 1411²).

The spelling of 71673156 in words is "seventy-one million, six hundred seventy-three thousand, one hundred fifty-six".