71204661 has 12 divisors (see below), whose sum is σ = 112201440. Its totient is φ = 43154280.

The previous prime is 71204611. The next prime is 71204699. The reversal of 71204661 is 16640217.

It is not a de Polignac number, because 71204661 - 2⁶ = 71204597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71204611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 359521 + ... + 359718.

It is an arithmetic number, because the mean of its divisors is an integer number (9350120).

Almost surely, 2^71204661 is an apocalyptic number.

It is an amenable number.

71204661 is a deficient number, since it is larger than the sum of its proper divisors (40996779).

71204661 is a wasteful number, since it uses less digits than its factorization.

71204661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 719256 (or 719253 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 71204661 is about 8438.2854301096. The cubic root of 71204661 is about 414.4792636359.

Adding to 71204661 its reverse (16640217), we get a palindrome (87844878).

It can be divided in two parts, 7120 and 4661, that added together give a triangular number (11781 = T₁₅₃).

The spelling of 71204661 in words is "seventy-one million, two hundred four thousand, six hundred sixty-one".