71838729 has 36 divisors (see below), whose sum is σ = 110423040. Its totient is φ = 44993520.

The previous prime is 71838721. The next prime is 71838731. The reversal of 71838729 is 92783817.

It is not a de Polignac number, because 71838729 - 2³ = 71838721 is a prime.

It is a Curzon number.

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

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 376024 + ... + 376214.

Almost surely, 2^71838729 is an apocalyptic number.

71838729 is a gapful number since it is divisible by the number (79) formed by its first and last digit.

It is an amenable number.

71838729 is a deficient number, since it is larger than the sum of its proper divisors (38584311).

71838729 is a wasteful number, since it uses less digits than its factorization.

71838729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322 (or 296 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 71838729 is about 8475.7730620870. The cubic root of 71838729 is about 415.7059238964.

It can be divided in two parts, 7 and 1838729, that added together give a square (1838736 = 1356²).

The spelling of 71838729 in words is "seventy-one million, eight hundred thirty-eight thousand, seven hundred twenty-nine".