71427737 has 4 divisors (see below), whose sum is σ = 71855616. Its totient is φ = 70999860.

The previous prime is 71427709. The next prime is 71427739. The reversal of 71427737 is 73772417.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 73772417 = 167 ⋅441751.

It is a cyclic number.

It is not a de Polignac number, because 71427737 - 2⁸ = 71427481 is a prime.

It is a super-2 number, since 2×71427737² = 10203843225882338, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71427737.

It is not an unprimeable number, because it can be changed into a prime (71427739) 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, 213689 + ... + 214022.

It is an arithmetic number, because the mean of its divisors is an integer number (17963904).

Almost surely, 2^71427737 is an apocalyptic number.

It is an amenable number.

71427737 is a deficient number, since it is larger than the sum of its proper divisors (427879).

71427737 is a wasteful number, since it uses less digits than its factorization.

71427737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427878.

The product of its digits is 57624, while the sum is 38.

The square root of 71427737 is about 8451.4931816810. The cubic root of 71427737 is about 414.9116510046.

The spelling of 71427737 in words is "seventy-one million, four hundred twenty-seven thousand, seven hundred thirty-seven".