81238794 has 128 divisors (see below), whose sum is σ = 216760320. Its totient is φ = 19699200.

The previous prime is 81238789. The next prime is 81238819. The reversal of 81238794 is 49783218.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 425239 + ... + 425429.

It is an arithmetic number, because the mean of its divisors is an integer number (1693440).

Almost surely, 2^81238794 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81238794, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108380160).

81238794 is an abundant number, since it is smaller than the sum of its proper divisors (135521526).

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

81238794 is a wasteful number, since it uses less digits than its factorization.

81238794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276.

The product of its digits is 96768, while the sum is 42.

The square root of 81238794 is about 9013.2565701859. The cubic root of 81238794 is about 433.0996398054.

The spelling of 81238794 in words is "eighty-one million, two hundred thirty-eight thousand, seven hundred ninety-four".