81428528383 has 4 divisors (see below), whose sum is σ = 81430880200. Its totient is φ = 81426176568.

The previous prime is 81428528341. The next prime is 81428528387. The reversal of 81428528383 is 38382582418.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81428528383 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81428528383.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81428528387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1123185 + ... + 1193482.

It is an arithmetic number, because the mean of its divisors is an integer number (20357720050).

Almost surely, 2^81428528383 is an apocalyptic number.

81428528383 is a deficient number, since it is larger than the sum of its proper divisors (2351817).

81428528383 is a wasteful number, since it uses less digits than its factorization.

81428528383 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2351816.

The product of its digits is 2949120, while the sum is 52.

The spelling of 81428528383 in words is "eighty-one billion, four hundred twenty-eight million, five hundred twenty-eight thousand, three hundred eighty-three".