71566420 has 24 divisors (see below), whose sum is σ = 152755848. Its totient is φ = 28156800.

The previous prime is 71566283. The next prime is 71566421. The reversal of 71566420 is 2466517.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3701776 + 67864644 = 1924^2 + 8238^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71566421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28111 + ... + 30550.

It is an arithmetic number, because the mean of its divisors is an integer number (6364827).

Almost surely, 2^71566420 is an apocalyptic number.

It is an amenable number.

71566420 is an abundant number, since it is smaller than the sum of its proper divisors (81189428).

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

71566420 is a wasteful number, since it uses less digits than its factorization.

71566420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58731 (or 58729 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 71566420 is about 8459.6938478884. The cubic root of 71566420 is about 415.1800061033.

The spelling of 71566420 in words is "seventy-one million, five hundred sixty-six thousand, four hundred twenty".