81394352 has 40 divisors (see below), whose sum is σ = 171384864. Its totient is φ = 37223424.

The previous prime is 81394321. The next prime is 81394363. The reversal of 81394352 is 25349318.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21773 + ... + 25235.

Almost surely, 2^81394352 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 81394352, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85692432).

81394352 is an abundant number, since it is smaller than the sum of its proper divisors (89990512).

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

81394352 is a wasteful number, since it uses less digits than its factorization.

81394352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3597 (or 3591 counting only the distinct ones).

The product of its digits is 25920, while the sum is 35.

The square root of 81394352 is about 9021.8818436067. The cubic root of 81394352 is about 433.3759000920.

The spelling of 81394352 in words is "eighty-one million, three hundred ninety-four thousand, three hundred fifty-two".