71538427 has 4 divisors (see below), whose sum is σ = 73471936. Its totient is φ = 69604920.

The previous prime is 71538419. The next prime is 71538433. The reversal of 71538427 is 72483517.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72483517 = 547 ⋅132511.

It is a cyclic number.

It is not a de Polignac number, because 71538427 - 2³ = 71538419 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 1933471 = 71538427 / (7 + 1 + 5 + 3 + 8 + 4 + 2 + 7).

It is not an unprimeable number, because it can be changed into a prime (71538497) 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, 966699 + ... + 966772.

It is an arithmetic number, because the mean of its divisors is an integer number (18367984).

Almost surely, 2^71538427 is an apocalyptic number.

71538427 is a deficient number, since it is larger than the sum of its proper divisors (1933509).

71538427 is a wasteful number, since it uses less digits than its factorization.

71538427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1933508.

The product of its digits is 47040, while the sum is 37.

The square root of 71538427 is about 8458.0391935720. The cubic root of 71538427 is about 415.1258668876.

The spelling of 71538427 in words is "seventy-one million, five hundred thirty-eight thousand, four hundred twenty-seven".