71390986 has 8 divisors (see below), whose sum is σ = 107485380. Its totient is φ = 35562528.

The previous prime is 71390971. The next prime is 71391013. The reversal of 71390986 is 68909317.

It can be written as a sum of positive squares in 2 ways, for example, as 46580625 + 24810361 = 6825^2 + 4981^2 .

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

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, 65811 + ... + 66886.

Almost surely, 2^71390986 is an apocalyptic number.

71390986 is a deficient number, since it is larger than the sum of its proper divisors (36094394).

71390986 is a wasteful number, since it uses less digits than its factorization.

71390986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132968.

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 71390986 is about 8449.3186707568. The cubic root of 71390986 is about 414.8404786810.

The spelling of 71390986 in words is "seventy-one million, three hundred ninety thousand, nine hundred eighty-six".