71688290 has 16 divisors (see below), whose sum is σ = 133489080. Its totient is φ = 27686400.

The previous prime is 71688283. The next prime is 71688317. The reversal of 71688290 is 9288617.

It can be written as a sum of positive squares in 4 ways, for example, as 59737441 + 11950849 = 7729^2 + 3457^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123311 + ... + 123890.

Almost surely, 2^71688290 is an apocalyptic number.

71688290 is a deficient number, since it is larger than the sum of its proper divisors (61800790).

71688290 is a wasteful number, since it uses less digits than its factorization.

71688290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247237.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 71688290 is about 8466.8937633586. The cubic root of 71688290 is about 415.4155415844.

The spelling of 71688290 in words is "seventy-one million, six hundred eighty-eight thousand, two hundred ninety".