71866916 has 12 divisors (see below), whose sum is σ = 137200560. Its totient is φ = 32666760.

The previous prime is 71866903. The next prime is 71866919. The reversal of 71866916 is 61966817.

It is a Harshad number since it is a multiple of its sum of digits (44), and also a Moran number because the ratio is a prime number: 1633339 = 71866916 / (7 + 1 + 8 + 6 + 6 + 9 + 1 + 6).

It is not an unprimeable number, because it can be changed into a prime (71866919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 816626 + ... + 816713.

It is an arithmetic number, because the mean of its divisors is an integer number (11433380).

Almost surely, 2^71866916 is an apocalyptic number.

It is an amenable number.

71866916 is a deficient number, since it is larger than the sum of its proper divisors (65333644).

71866916 is a wasteful number, since it uses less digits than its factorization.

71866916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1633354 (or 1633352 counting only the distinct ones).

The product of its digits is 108864, while the sum is 44.

The square root of 71866916 is about 8477.4356971905. The cubic root of 71866916 is about 415.7602862664.

Subtracting from 71866916 its reverse (61966817), we obtain a palindrome (9900099).

The spelling of 71866916 in words is "seventy-one million, eight hundred sixty-six thousand, nine hundred sixteen".