71242436 has 12 divisors (see below), whose sum is σ = 124798380. Its totient is φ = 35585760.

The previous prime is 71242421. The next prime is 71242439. The reversal of 71242436 is 63424217.

It can be written as a sum of positive squares in 2 ways, for example, as 34105600 + 37136836 = 5840^2 + 6094^2 .

It is a junction number, because it is equal to n+sod(n) for n = 71242399 and 71242408.

It is not an unprimeable number, because it can be changed into a prime (71242439) 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, 4055 + ... + 12606.

It is an arithmetic number, because the mean of its divisors is an integer number (10399865).

Almost surely, 2^71242436 is an apocalyptic number.

It is an amenable number.

71242436 is a deficient number, since it is larger than the sum of its proper divisors (53555944).

71242436 is a wasteful number, since it uses less digits than its factorization.

71242436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17734 (or 17732 counting only the distinct ones).

The product of its digits is 8064, while the sum is 29.

The square root of 71242436 is about 8440.5234434838. The cubic root of 71242436 is about 414.5525462274.

The spelling of 71242436 in words is "seventy-one million, two hundred forty-two thousand, four hundred thirty-six".