71578 has 8 divisors (see below), whose sum is σ = 115668. Its totient is φ = 33024.

The previous prime is 71569. The next prime is 71593. The reversal of 71578 is 87517.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 71289 + 289 = 267^2 + 17^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a plaindrome in base 16.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1351 + ... + 1402.

2⁷¹⁵⁷⁸ is an apocalyptic number.

71578 is a deficient number, since it is larger than the sum of its proper divisors (44090).

71578 is a wasteful number, since it uses less digits than its factorization.

71578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2768.

The product of its digits is 1960, while the sum is 28.

The square root of 71578 is about 267.5406511168. The cubic root of 71578 is about 41.5202398007.

The spelling of 71578 in words is "seventy-one thousand, five hundred seventy-eight".