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66981432 = 2337256957
BaseRepresentation
bin1111111110000…
…0111000111000
311200001000020210
43333200320320
5114121401212
610351351120
71442222100
oct377407070
9150030223
1066981432
113489a161
121a5224a0
1310b528ab
148c78200
155d3153c
hex3fe0e38

66981432 has 48 divisors (see below), whose sum is σ = 194796360. Its totient is φ = 19137216.

The previous prime is 66981389. The next prime is 66981449. The reversal of 66981432 is 23418966.

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27303 + ... + 29654.

Almost surely, 266981432 is an apocalyptic number.

It is an amenable number.

66981432 is an abundant number, since it is smaller than the sum of its proper divisors (127814928).

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

66981432 is a wasteful number, since it uses less digits than its factorization.

66981432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56980 (or 56969 counting only the distinct ones).

The product of its digits is 62208, while the sum is 39.

The square root of 66981432 is about 8184.2184721573. The cubic root of 66981432 is about 406.1172867645.

The spelling of 66981432 in words is "sixty-six million, nine hundred eighty-one thousand, four hundred thirty-two".

Divisors: 1 2 3 4 6 7 8 12 14 21 24 28 42 49 56 84 98 147 168 196 294 392 588 1176 56957 113914 170871 227828 341742 398699 455656 683484 797398 1196097 1366968 1594796 2392194 2790893 3189592 4784388 5581786 8372679 9568776 11163572 16745358 22327144 33490716 66981432