81030504828 has 576 divisors, whose sum is σ = 271431336960. Its totient is φ = 18519072768.

The previous prime is 81030504827. The next prime is 81030504859. The reversal of 81030504828 is 82840503018.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81030504827) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 91353001 + ... + 91353887.

It is an arithmetic number, because the mean of its divisors is an integer number (471234960).

Almost surely, 2^81030504828 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81030504828, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (135715668480).

81030504828 is an abundant number, since it is smaller than the sum of its proper divisors (190400832132).

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

81030504828 is a wasteful number, since it uses less digits than its factorization.

81030504828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 994 (or 985 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 39.

The spelling of 81030504828 in words is "eighty-one billion, thirty million, five hundred four thousand, eight hundred twenty-eight".