71838728 has 16 divisors (see below), whose sum is σ = 145059180. Its totient is φ = 33156288.

The previous prime is 71838721. The next prime is 71838731. The reversal of 71838728 is 82783817.

It can be written as a sum of positive squares in 2 ways, for example, as 69522244 + 2316484 = 8338^2 + 1522^2 .

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (71838721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 345275 + ... + 345482.

Almost surely, 2^71838728 is an apocalyptic number.

It is an amenable number.

71838728 is an abundant number, since it is smaller than the sum of its proper divisors (73220452).

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

71838728 is a wasteful number, since it uses less digits than its factorization.

71838728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 690776 (or 690772 counting only the distinct ones).

The product of its digits is 150528, while the sum is 44.

The square root of 71838728 is about 8475.7730030954. The cubic root of 71838728 is about 415.7059219675.

The spelling of 71838728 in words is "seventy-one million, eight hundred thirty-eight thousand, seven hundred twenty-eight".