71809772 has 24 divisors (see below), whose sum is σ = 131507712. Its totient is φ = 34245200.

The previous prime is 71809769. The next prime is 71809799. The reversal of 71809772 is 27790817.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38747 + ... + 40557.

It is an arithmetic number, because the mean of its divisors is an integer number (5479488).

Almost surely, 2^71809772 is an apocalyptic number.

It is an amenable number.

71809772 is a deficient number, since it is larger than the sum of its proper divisors (59697940).

71809772 is a wasteful number, since it uses less digits than its factorization.

71809772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2269 (or 2267 counting only the distinct ones).

The product of its (nonzero) digits is 49392, while the sum is 41.

The square root of 71809772 is about 8474.0646681507. The cubic root of 71809772 is about 415.6500616693.

The spelling of 71809772 in words is "seventy-one million, eight hundred nine thousand, seven hundred seventy-two".