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71670221 = 7371671657
BaseRepresentation
bin1000100010110…
…01100111001101
311222212020001122
410101121213031
5121321421341
611040050325
71530121040
oct421314715
9158766048
1071670221
1137501997
12200039a5
1311b04b1c
149738c57
15645a94b
hex44599cd

71670221 has 16 divisors (see below), whose sum is σ = 84677376. Its totient is φ = 59377536.

The previous prime is 71670217. The next prime is 71670227. The reversal of 71670221 is 12207617.

It is a cyclic number.

It is not a de Polignac number, because 71670221 - 22 = 71670217 is a prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71670227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42425 + ... + 44081.

It is an arithmetic number, because the mean of its divisors is an integer number (5292336).

Almost surely, 271670221 is an apocalyptic number.

It is an amenable number.

71670221 is a deficient number, since it is larger than the sum of its proper divisors (13007155).

71670221 is a wasteful number, since it uses less digits than its factorization.

71670221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1868.

The product of its (nonzero) digits is 1176, while the sum is 26.

The square root of 71670221 is about 8465.8266578049. The cubic root of 71670221 is about 415.3806368873.

Adding to 71670221 its reverse (12207617), we get a palindrome (83877838).

The spelling of 71670221 in words is "seventy-one million, six hundred seventy thousand, two hundred twenty-one".

Divisors: 1 7 37 167 259 1169 1657 6179 11599 43253 61309 276719 429163 1937033 10238603 71670221