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68128883 = 671016849
BaseRepresentation
bin1000000111110…
…01000001110011
311202012022020222
410003321001303
5114420111013
610432123255
71455041324
oct403710163
9152168228
1068128883
1135503269
121a99652b
1311164c64
14909644b
155eab508
hex40f9073

68128883 has 4 divisors (see below), whose sum is σ = 69145800. Its totient is φ = 67111968.

The previous prime is 68128871. The next prime is 68128891. The reversal of 68128883 is 38882186.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-68128883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68124883) 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, 508358 + ... + 508491.

It is an arithmetic number, because the mean of its divisors is an integer number (17286450).

Almost surely, 268128883 is an apocalyptic number.

68128883 is a deficient number, since it is larger than the sum of its proper divisors (1016917).

68128883 is a wasteful number, since it uses less digits than its factorization.

68128883 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1016916.

The product of its digits is 147456, while the sum is 44.

The square root of 68128883 is about 8254.0222316153. The cubic root of 68128883 is about 408.4232180117.

The spelling of 68128883 in words is "sixty-eight million, one hundred twenty-eight thousand, eight hundred eighty-three".

Divisors: 1 67 1016849 68128883