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66822820 = 22523145267
BaseRepresentation
bin1111111011101…
…0001010100100
311122201221200021
43332322022210
5114101312240
610344124524
71440661501
oct376721244
9148657607
1066822820
11347a0a79
121a466744
1310ac863c
148c364a8
155cee54a
hex3fba2a4

66822820 has 24 divisors (see below), whose sum is σ = 146430144. Its totient is φ = 25566816.

The previous prime is 66822803. The next prime is 66822823. The reversal of 66822820 is 2822866.

It is not an unprimeable number, because it can be changed into a prime (66822823) 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, 72174 + ... + 73093.

It is an arithmetic number, because the mean of its divisors is an integer number (6101256).

Almost surely, 266822820 is an apocalyptic number.

It is an amenable number.

66822820 is an abundant number, since it is smaller than the sum of its proper divisors (79607324).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66822820 is a wasteful number, since it uses less digits than its factorization.

66822820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145299 (or 145297 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 34.

The square root of 66822820 is about 8174.5226160309. The cubic root of 66822820 is about 405.7964715519.

The spelling of 66822820 in words is "sixty-six million, eight hundred twenty-two thousand, eight hundred twenty".

Divisors: 1 2 4 5 10 20 23 46 92 115 230 460 145267 290534 581068 726335 1452670 2905340 3341141 6682282 13364564 16705705 33411410 66822820