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639365061 = 3645133037
BaseRepresentation
bin100110000110111…
…110111111000101
31122120002002222110
4212012332333011
52302134140221
6143235451233
721562341036
oct4606767705
91576062873
10639365061
112a89a5485
1215a156b19
13a25cc42a
1460cb2a8d
153b1e6776
hex261befc5

639365061 has 8 divisors (see below), whose sum is σ = 852644704. Its totient is φ = 426164400.

The previous prime is 639365057. The next prime is 639365081. The reversal of 639365061 is 160563936.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 639365061 - 22 = 639365057 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639365081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2835 + ... + 35871.

It is an arithmetic number, because the mean of its divisors is an integer number (106580588).

Almost surely, 2639365061 is an apocalyptic number.

It is an amenable number.

639365061 is a deficient number, since it is larger than the sum of its proper divisors (213279643).

639365061 is a wasteful number, since it uses less digits than its factorization.

639365061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39491.

The product of its (nonzero) digits is 87480, while the sum is 39.

The square root of 639365061 is about 25285.6690834947. The cubic root of 639365061 is about 861.4887953399.

The spelling of 639365061 in words is "six hundred thirty-nine million, three hundred sixty-five thousand, sixty-one".

Divisors: 1 3 6451 19353 33037 99111 213121687 639365061