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689390680209 = 3711192931379461
BaseRepresentation
bin10100000100000101110…
…00101111100010010001
32102220102211012002222220
422002002320233202101
542243333003231314
61244411322451253
7100543513045020
oct12020270574221
92386384162886
10689390680209
11246407080710
12b1737663b29
135001746cb1a
142551c2908b7
1512dec98a3a9
hexa082e2f891

689390680209 has 256 divisors, whose sum is σ = 1294368768000. Its totient is φ = 315487872000.

The previous prime is 689390680207. The next prime is 689390680241. The reversal of 689390680209 is 902086093986.

It is not a de Polignac number, because 689390680209 - 21 = 689390680207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (689390680207) by changing a digit.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 1495424239 + ... + 1495424699.

It is an arithmetic number, because the mean of its divisors is an integer number (5056128000).

Almost surely, 2689390680209 is an apocalyptic number.

It is an amenable number.

689390680209 is a deficient number, since it is larger than the sum of its proper divisors (604978087791).

689390680209 is a wasteful number, since it uses less digits than its factorization.

689390680209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 940.

The product of its (nonzero) digits is 10077696, while the sum is 60.

The spelling of 689390680209 in words is "six hundred eighty-nine billion, three hundred ninety million, six hundred eighty thousand, two hundred nine".