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81344592 = 243271747101
BaseRepresentation
bin1001101100100…
…11100001010000
312200001201210200
410312103201100
5131311011332
612023255200
72005263150
oct466234120
9180051720
1081344592
1141a0a43a
12232aa500
1313b113c4
14ab36760
15721c17c
hex4d93850

81344592 has 240 divisors, whose sum is σ = 284124672. Its totient is φ = 21196800.

The previous prime is 81344579. The next prime is 81344597. The reversal of 81344592 is 29544318.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81344597) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 805342 + ... + 805442.

Almost surely, 281344592 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 81344592, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142062336).

81344592 is an abundant number, since it is smaller than the sum of its proper divisors (202780080).

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

81344592 is a wasteful number, since it uses less digits than its factorization.

81344592 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186 (or 177 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 81344592 is about 9019.1236824871. The cubic root of 81344592 is about 433.2875680794.

The spelling of 81344592 in words is "eighty-one million, three hundred forty-four thousand, five hundred ninety-two".