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688705683 = 31713504033
BaseRepresentation
bin101001000011001…
…101000010010011
31202222220212120220
4221003031002103
52402302040213
6152201204123
723031621201
oct5103150223
91688825526
10688705683
11323835856
12172790643
13ac8b6673
1467678071
15406e0e23
hex290cd093

688705683 has 8 divisors (see below), whose sum is σ = 972290448. Its totient is φ = 432129024.

The previous prime is 688705631. The next prime is 688705727. The reversal of 688705683 is 386507886.

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

It is not a de Polignac number, because 688705683 - 213 = 688697491 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51), and also a Moran number because the ratio is a prime number: 13504033 = 688705683 / (6 + 8 + 8 + 7 + 0 + 5 + 6 + 8 + 3).

It is not an unprimeable number, because it can be changed into a prime (688705603) 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, 6751966 + ... + 6752067.

It is an arithmetic number, because the mean of its divisors is an integer number (121536306).

Almost surely, 2688705683 is an apocalyptic number.

688705683 is a deficient number, since it is larger than the sum of its proper divisors (283584765).

688705683 is a wasteful number, since it uses less digits than its factorization.

688705683 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13504053.

The product of its (nonzero) digits is 1935360, while the sum is 51.

The square root of 688705683 is about 26243.2026056272. The cubic root of 688705683 is about 883.1027196093.

The spelling of 688705683 in words is "six hundred eighty-eight million, seven hundred five thousand, six hundred eighty-three".

Divisors: 1 3 17 51 13504033 40512099 229568561 688705683