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66831172 = 2216707793
BaseRepresentation
bin1111111011110…
…0001101000100
311122202101010121
43332330031010
5114102044142
610344231324
71441025032
oct376741504
9148671117
1066831172
11347a7281
121a46b544
1310acc395
148c39552
155d01c67
hex3fbc344

66831172 has 6 divisors (see below), whose sum is σ = 116954558. Its totient is φ = 33415584.

The previous prime is 66831143. The next prime is 66831179. The reversal of 66831172 is 27113866.

It can be written as a sum of positive squares in only one way, i.e., 65545216 + 1285956 = 8096^2 + 1134^2 .

It is not an unprimeable number, because it can be changed into a prime (66831179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8353893 + ... + 8353900.

Almost surely, 266831172 is an apocalyptic number.

It is an amenable number.

66831172 is a deficient number, since it is larger than the sum of its proper divisors (50123386).

66831172 is a wasteful number, since it uses less digits than its factorization.

66831172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16707797 (or 16707795 counting only the distinct ones).

The product of its digits is 12096, while the sum is 34.

The square root of 66831172 is about 8175.0334555890. The cubic root of 66831172 is about 405.8133773083.

The spelling of 66831172 in words is "sixty-six million, eight hundred thirty-one thousand, one hundred seventy-two".

Divisors: 1 2 4 16707793 33415586 66831172