81802994148 has 108 divisors (see below), whose sum is σ = 216736137072. Its totient is φ = 27011899440.

The previous prime is 81802994131. The next prime is 81802994167. The reversal of 81802994148 is 84149920818.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (108).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 81802994094 and 81802994103.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2793543 + ... + 2822673.

It is an arithmetic number, because the mean of its divisors is an integer number (2006816084).

Almost surely, 2^81802994148 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 81802994148, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108368068536).

81802994148 is an abundant number, since it is smaller than the sum of its proper divisors (134933142924).

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

81802994148 is a wasteful number, since it uses less digits than its factorization.

81802994148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29266 (or 29243 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 54.

The spelling of 81802994148 in words is "eighty-one billion, eight hundred two million, nine hundred ninety-four thousand, one hundred forty-eight".