71640816 has 40 divisors (see below), whose sum is σ = 199310160. Its totient is φ = 22043136.

The previous prime is 71640797. The next prime is 71640847. The reversal of 71640816 is 61804617.

It is a happy number.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 56781 + ... + 58028.

It is an arithmetic number, because the mean of its divisors is an integer number (4982754).

Almost surely, 2^71640816 is an apocalyptic number.

It is an amenable number.

71640816 is an abundant number, since it is smaller than the sum of its proper divisors (127669344).

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

71640816 is a wasteful number, since it uses less digits than its factorization.

71640816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114833 (or 114827 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 71640816 is about 8464.0897915842. The cubic root of 71640816 is about 415.3238213867.

The spelling of 71640816 in words is "seventy-one million, six hundred forty thousand, eight hundred sixteen".