71809061828 has 24 divisors (see below), whose sum is σ = 143785754112. Its totient is φ = 30739391424.

The previous prime is 71809061773. The next prime is 71809061839. The reversal of 71809061828 is 82816090817.

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, 1472276 + ... + 1520267.

It is an arithmetic number, because the mean of its divisors is an integer number (5991073088).

Almost surely, 2^71809061828 is an apocalyptic number.

It is an amenable number.

71809061828 is an abundant number, since it is smaller than the sum of its proper divisors (71976692284).

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

71809061828 is a wasteful number, since it uses less digits than its factorization.

71809061828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2993411 (or 2993409 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 50.

The spelling of 71809061828 in words is "seventy-one billion, eight hundred nine million, sixty-one thousand, eight hundred twenty-eight".