81419392 has 96 divisors (see below), whose sum is σ = 180368640. Its totient is φ = 36556800.

The previous prime is 81419363. The next prime is 81419407. The reversal of 81419392 is 29391418.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1146717 + ... + 1146787.

It is an arithmetic number, because the mean of its divisors is an integer number (1878840).

Almost surely, 2^81419392 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 81419392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90184320).

81419392 is an abundant number, since it is smaller than the sum of its proper divisors (98949248).

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

81419392 is a wasteful number, since it uses less digits than its factorization.

81419392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150 (or 121 counting only the distinct ones).

The product of its digits is 15552, while the sum is 37.

The square root of 81419392 is about 9023.2694739767. The cubic root of 81419392 is about 433.4203365083.

The spelling of 81419392 in words is "eighty-one million, four hundred nineteen thousand, three hundred ninety-two".