71532729 has 24 divisors (see below), whose sum is σ = 107113032. Its totient is φ = 45964800.

The previous prime is 71532709. The next prime is 71532793. The reversal of 71532729 is 92723517.

It can be written as a sum of positive squares in 4 ways, for example, as 164025 + 71368704 = 405^2 + 8448^2 .

It is not a de Polignac number, because 71532729 - 2¹¹ = 71530681 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 71532693 and 71532702.

It is not an unprimeable number, because it can be changed into a prime (71532709) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36679 + ... + 38579.

It is an arithmetic number, because the mean of its divisors is an integer number (4463043).

Almost surely, 2^71532729 is an apocalyptic number.

It is an amenable number.

71532729 is a deficient number, since it is larger than the sum of its proper divisors (35580303).

71532729 is a wasteful number, since it uses less digits than its factorization.

71532729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2057 (or 2054 counting only the distinct ones).

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

The square root of 71532729 is about 8457.7023475646. The cubic root of 71532729 is about 415.1148450722.

The spelling of 71532729 in words is "seventy-one million, five hundred thirty-two thousand, seven hundred twenty-nine".