81428479552 has 112 divisors (see below), whose sum is σ = 188402081920. Its totient is φ = 34198474752.

The previous prime is 81428479543. The next prime is 81428479567. The reversal of 81428479552 is 25597482418.

It is a tau number, because it is divible by the number of its divisors (112).

It is a junction number, because it is equal to n+sod(n) for n = 81428479493 and 81428479502.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5126599 + ... + 5142457.

Almost surely, 2^81428479552 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 81428479552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94201040960).

81428479552 is an abundant number, since it is smaller than the sum of its proper divisors (106973602368).

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

81428479552 is a wasteful number, since it uses less digits than its factorization.

81428479552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16108 (or 16098 counting only the distinct ones).

The product of its digits is 6451200, while the sum is 55.

The spelling of 81428479552 in words is "eighty-one billion, four hundred twenty-eight million, four hundred seventy-nine thousand, five hundred fifty-two".