71742281 has 16 divisors (see below), whose sum is σ = 78798720. Its totient is φ = 64920960.

The previous prime is 71742269. The next prime is 71742287. The reversal of 71742281 is 18224717.

It is a happy number.

It is not a de Polignac number, because 71742281 - 2⁶ = 71742217 is a prime.

It is a super-2 number, since 2×71742281² = 10293909766165922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (71742287) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 175205 + ... + 175613.

It is an arithmetic number, because the mean of its divisors is an integer number (4924920).

Almost surely, 2^71742281 is an apocalyptic number.

It is an amenable number.

71742281 is a deficient number, since it is larger than the sum of its proper divisors (7056439).

71742281 is a wasteful number, since it uses less digits than its factorization.

71742281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 656.

The product of its digits is 6272, while the sum is 32.

The square root of 71742281 is about 8470.0815226301. The cubic root of 71742281 is about 415.5198034857.

Adding to 71742281 its reverse (18224717), we get a palindrome (89966998).

The spelling of 71742281 in words is "seventy-one million, seven hundred forty-two thousand, two hundred eighty-one".