71621204 has 24 divisors (see below), whose sum is σ = 132972840. Its totient is φ = 33637376.

The previous prime is 71621201. The next prime is 71621227. The reversal of 71621204 is 40212617.

It can be written as a sum of positive squares in 4 ways, for example, as 58675600 + 12945604 = 7660^2 + 3598^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 71621204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71621201) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 57662 + ... + 58890.

It is an arithmetic number, because the mean of its divisors is an integer number (5540535).

Almost surely, 2^71621204 is an apocalyptic number.

It is an amenable number.

71621204 is a deficient number, since it is larger than the sum of its proper divisors (61351636).

71621204 is a wasteful number, since it uses less digits than its factorization.

71621204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2107 (or 2105 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 71621204 is about 8462.9311706997. The cubic root of 71621204 is about 415.2859189980.

The spelling of 71621204 in words is "seventy-one million, six hundred twenty-one thousand, two hundred four".