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81007700 = 22524318839
BaseRepresentation
bin1001101010000…
…01010001010100
312122102121200012
410311001101110
5131214221300
612012135352
72002361024
oct465012124
9178377605
1081007700
11417aa314
1223167558
1313a23c67
14aa89a84
1571a2435
hex4d41454

81007700 has 36 divisors (see below), whose sum is σ = 179884320. Its totient is φ = 31647840.

The previous prime is 81007699. The next prime is 81007727. The reversal of 81007700 is 770018.

Adding to 81007700 its reverse (770018), we get a palindrome (81777718).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5120 + ... + 13719.

Almost surely, 281007700 is an apocalyptic number.

It is an amenable number.

81007700 is an abundant number, since it is smaller than the sum of its proper divisors (98876620).

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

81007700 is a wasteful number, since it uses less digits than its factorization.

81007700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18896 (or 18889 counting only the distinct ones).

The product of its (nonzero) digits is 392, while the sum is 23.

The square root of 81007700 is about 9000.4277676119. The cubic root of 81007700 is about 432.6885809315.

The spelling of 81007700 in words is "eighty-one million, seven thousand, seven hundred".

Divisors: 1 2 4 5 10 20 25 43 50 86 100 172 215 430 860 1075 2150 4300 18839 37678 75356 94195 188390 376780 470975 810077 941950 1620154 1883900 3240308 4050385 8100770 16201540 20251925 40503850 81007700