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BaseRepresentation
bin1111101100001…
…1011001110000
311120211121012110
43323003121300
5113321441310
610310325320
71426251645
oct373033160
9146747173
1065812080
1134170654
121a059840
1310833579
148a51dcc
155b9ed20
hex3ec3670

65812080 has 80 divisors (see below), whose sum is σ = 204808320. Its totient is φ = 17481984.

The previous prime is 65812073. The next prime is 65812091. The reversal of 65812080 is 8021856.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106011 + ... + 106629.

It is an arithmetic number, because the mean of its divisors is an integer number (2560104).

Almost surely, 265812080 is an apocalyptic number.

65812080 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65812080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102404160).

65812080 is an abundant number, since it is smaller than the sum of its proper divisors (138996240).

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

65812080 is a wasteful number, since it uses less digits than its factorization.

65812080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1078 (or 1072 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 65812080 is about 8112.4644837435. The cubic root of 65812080 is about 403.7400870446.

The spelling of 65812080 in words is "sixty-five million, eight hundred twelve thousand, eighty".