81794388 has 48 divisors (see below), whose sum is σ = 208167680. Its totient is φ = 24845184.

The previous prime is 81794381. The next prime is 81794389. The reversal of 81794388 is 88349718.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81794381) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9006 + ... + 15642.

Almost surely, 2^81794388 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 81794388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104083840).

81794388 is an abundant number, since it is smaller than the sum of its proper divisors (126373292).

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

81794388 is a wasteful number, since it uses less digits than its factorization.

81794388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6736 (or 6734 counting only the distinct ones).

The product of its digits is 387072, while the sum is 48.

The square root of 81794388 is about 9044.0249889084. The cubic root of 81794388 is about 434.0847237032.

The spelling of 81794388 in words is "eighty-one million, seven hundred ninety-four thousand, three hundred eighty-eight".