71880645 has 16 divisors (see below), whose sum is σ = 115174080. Its totient is φ = 38281344.

The previous prime is 71880637. The next prime is 71880797. The reversal of 71880645 is 54608817.

It is not a de Polignac number, because 71880645 - 2³ = 71880637 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8761 + ... + 14849.

It is an arithmetic number, because the mean of its divisors is an integer number (7198380).

Almost surely, 2^71880645 is an apocalyptic number.

It is an amenable number.

71880645 is a deficient number, since it is larger than the sum of its proper divisors (43293435).

71880645 is a wasteful number, since it uses less digits than its factorization.

71880645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6884.

The product of its (nonzero) digits is 53760, while the sum is 39.

The square root of 71880645 is about 8478.2453963070. The cubic root of 71880645 is about 415.7867593171.

The spelling of 71880645 in words is "seventy-one million, eight hundred eighty thousand, six hundred forty-five".