81464192 has 32 divisors (see below), whose sum is σ = 164138400. Its totient is φ = 40268800.

The previous prime is 81464179. The next prime is 81464203. The reversal of 81464192 is 29146418.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (32).

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 3 ways as a sum of consecutive naturals, for example, 7817 + ... + 14967.

It is an arithmetic number, because the mean of its divisors is an integer number (5129325).

Almost surely, 2^81464192 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 81464192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82069200).

81464192 is an abundant number, since it is smaller than the sum of its proper divisors (82674208).

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

81464192 is an equidigital number, since it uses as much as digits as its factorization.

81464192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7254 (or 7242 counting only the distinct ones).

The product of its digits is 13824, while the sum is 35.

The square root of 81464192 is about 9025.7516030522. The cubic root of 81464192 is about 433.4998166351.

The spelling of 81464192 in words is "eighty-one million, four hundred sixty-four thousand, one hundred ninety-two".