81184304828 has 18 divisors (see below), whose sum is σ = 156162372408. Its totient is φ = 36901956520.

The previous prime is 81184304819. The next prime is 81184304843. The reversal of 81184304828 is 82840348118.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 83867600 + ... + 83868567.

It is an arithmetic number, because the mean of its divisors is an integer number (8675687356).

Almost surely, 2^81184304828 is an apocalyptic number.

It is an amenable number.

81184304828 is a deficient number, since it is larger than the sum of its proper divisors (74978067580).

81184304828 is a wasteful number, since it uses less digits than its factorization.

81184304828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167736193 (or 167736180 counting only the distinct ones).

The product of its (nonzero) digits is 393216, while the sum is 47.

The spelling of 81184304828 in words is "eighty-one billion, one hundred eighty-four million, three hundred four thousand, eight hundred twenty-eight".