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644404060136236 = 22375479794685433
BaseRepresentation
bin1001001010000101010000001…
…1000110001010001100101100
310010111122102111220221112210211
42102201110003012022030230
51133430404003343324421
610202311045521512204
7252506441223660031
oct22241240306121454
93114572456845724
10644404060136236
11177366255405474
12603359a7aa2664
132187507172680a
14b51b474175388
154e77665e419e1
hex24a150318a32c

644404060136236 has 24 divisors (see below), whose sum is σ = 1158397063433120. Its totient is φ = 313436649347712.

The previous prime is 644404060136173. The next prime is 644404060136237. The reversal of 644404060136236 is 632631060404446.

It is a self number, because there is not a number n which added to its sum of digits gives 644404060136236.

It is not an unprimeable number, because it can be changed into a prime (644404060136237) 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, 396531825 + ... + 398153608.

Almost surely, 2644404060136236 is an apocalyptic number.

It is an amenable number.

644404060136236 is a deficient number, since it is larger than the sum of its proper divisors (513993003296884).

644404060136236 is a wasteful number, since it uses less digits than its factorization.

644404060136236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 794690953 (or 794690951 counting only the distinct ones).

The product of its (nonzero) digits is 5971968, while the sum is 49.

The spelling of 644404060136236 in words is "six hundred forty-four trillion, four hundred four billion, sixty million, one hundred thirty-six thousand, two hundred thirty-six".

Divisors: 1 2 4 37 74 148 5479 10958 21916 202723 405446 810892 794685433 1589370866 3178741732 29403361021 58806722042 117613444084 4354081487407 8708162974814 17416325949628 161101015034059 322202030068118 644404060136236