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65643616 = 253166173
BaseRepresentation
bin1111101001101…
…0010001100000
311120112001010001
43322122101200
5113301043431
610302545344
71424650543
oct372322140
9146461101
1065643616
1134066025
1219b98254
13107a499c
148a0a85a
155b69e61
hex3e9a460

65643616 has 24 divisors (see below), whose sum is σ = 133406784. Its totient is φ = 31762560.

The previous prime is 65643607. The next prime is 65643619. The reversal of 65643616 is 61634656.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65643619) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32095 + ... + 34078.

It is an arithmetic number, because the mean of its divisors is an integer number (5558616).

Almost surely, 265643616 is an apocalyptic number.

It is an amenable number.

65643616 is an abundant number, since it is smaller than the sum of its proper divisors (67763168).

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

65643616 is a wasteful number, since it uses less digits than its factorization.

65643616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66214 (or 66206 counting only the distinct ones).

The product of its digits is 77760, while the sum is 37.

The square root of 65643616 is about 8102.0747960013. The cubic root of 65643616 is about 403.3952983290.

The spelling of 65643616 in words is "sixty-five million, six hundred forty-three thousand, six hundred sixteen".

Divisors: 1 2 4 8 16 31 32 62 124 248 496 992 66173 132346 264692 529384 1058768 2051363 2117536 4102726 8205452 16410904 32821808 65643616