71871970 has 8 divisors (see below), whose sum is σ = 129369564. Its totient is φ = 28748784.

The previous prime is 71871949. The next prime is 71871979. The reversal of 71871970 is 7917817.

It can be written as a sum of positive squares in 2 ways, for example, as 69039481 + 2832489 = 8309^2 + 1683^2 .

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

It is a super-3 number, since 3×71871970³ (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (71871979) 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, 3593589 + ... + 3593608.

Almost surely, 2^71871970 is an apocalyptic number.

71871970 is a deficient number, since it is larger than the sum of its proper divisors (57497594).

71871970 is a wasteful number, since it uses less digits than its factorization.

71871970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7187204.

The product of its (nonzero) digits is 24696, while the sum is 40.

The square root of 71871970 is about 8477.7337773723. The cubic root of 71871970 is about 415.7700320732.

The spelling of 71871970 in words is "seventy-one million, eight hundred seventy-one thousand, nine hundred seventy".