71660404 has 6 divisors (see below), whose sum is σ = 125405714. Its totient is φ = 35830200.

The previous prime is 71660353. The next prime is 71660431. The reversal of 71660404 is 40406617.

It can be written as a sum of positive squares in only one way, i.e., 71571600 + 88804 = 8460^2 + 298^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8957547 + ... + 8957554.

Almost surely, 2^71660404 is an apocalyptic number.

It is an amenable number.

71660404 is a deficient number, since it is larger than the sum of its proper divisors (53745310).

71660404 is a wasteful number, since it uses less digits than its factorization.

71660404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17915105 (or 17915103 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 71660404 is about 8465.2468363303. The cubic root of 71660404 is about 415.3616704888.

The spelling of 71660404 in words is "seventy-one million, six hundred sixty thousand, four hundred four".