71205066 has 24 divisors (see below), whose sum is σ = 154845444. Its totient is φ = 23647680.

The previous prime is 71205049. The next prime is 71205077. The reversal of 71205066 is 66050217.

It can be written as a sum of positive squares in 2 ways, for example, as 50765625 + 20439441 = 7125^2 + 4521^2 .

It is a super-2 number, since 2×71205066² = 10140322848128712, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2155 + ... + 12126.

Almost surely, 2^71205066 is an apocalyptic number.

71205066 is an abundant number, since it is smaller than the sum of its proper divisors (83640378).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71205066 is a wasteful number, since it uses less digits than its factorization.

71205066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14566 (or 14563 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 71205066 is about 8438.3094278416. The cubic root of 71205066 is about 414.4800494636.

The spelling of 71205066 in words is "seventy-one million, two hundred five thousand, sixty-six".