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81275573232 = 243373896163
BaseRepresentation
bin100101110110001100…
…1101101001111110000
321202210020022220112000
41023230121231033300
52312423021320412
6101200521334000
75605040655000
oct1135431551760
9252706286460
1081275573232
1131517a40137
1213903037300
137883499789
143d1033c000
1521aa4864dc
hex12ec66d3f0

81275573232 has 320 divisors, whose sum is σ = 275160960000. Its totient is φ = 22956950016.

The previous prime is 81275573221. The next prime is 81275573237. The reversal of 81275573232 is 23237557218.

81275573232 is a `hidden beast` number, since 8 + 1 + 2 + 75 + 573 + 2 + 3 + 2 = 666.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81275573237) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 13184583 + ... + 13190745.

It is an arithmetic number, because the mean of its divisors is an integer number (859878000).

Almost surely, 281275573232 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 81275573232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (137580480000).

81275573232 is an abundant number, since it is smaller than the sum of its proper divisors (193885386768).

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

81275573232 is a wasteful number, since it uses less digits than its factorization.

81275573232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6290 (or 6264 counting only the distinct ones).

The product of its digits is 705600, while the sum is 45.

The spelling of 81275573232 in words is "eighty-one billion, two hundred seventy-five million, five hundred seventy-three thousand, two hundred thirty-two".