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66707031 = 3171307981
BaseRepresentation
bin1111111001110…
…1111001010111
311122112001211210
43332131321113
5114034111111
610341432503
71440000066
oct376357127
9148461753
1066707031
1134721a86
121a40b733
1310a87a21
148c061dd
155cca0a6
hex3f9de57

66707031 has 8 divisors (see below), whose sum is σ = 94174704. Its totient is φ = 41855360.

The previous prime is 66707027. The next prime is 66707033. The reversal of 66707031 is 13070766.

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

It is not a de Polignac number, because 66707031 - 22 = 66707027 is a prime.

It is a super-2 number, since 2×667070312 = 8899655969669922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66707031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66707033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 653940 + ... + 654041.

It is an arithmetic number, because the mean of its divisors is an integer number (11771838).

Almost surely, 266707031 is an apocalyptic number.

66707031 is a deficient number, since it is larger than the sum of its proper divisors (27467673).

66707031 is a wasteful number, since it uses less digits than its factorization.

66707031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1308001.

The product of its (nonzero) digits is 5292, while the sum is 30.

The square root of 66707031 is about 8167.4372357552. The cubic root of 66707031 is about 405.5619512040.

Adding to 66707031 its reverse (13070766), we get a palindrome (79777797).

The spelling of 66707031 in words is "sixty-six million, seven hundred seven thousand, thirty-one".

Divisors: 1 3 17 51 1307981 3923943 22235677 66707031