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66640242 = 23107103801
BaseRepresentation
bin1111111000110…
…1100101110010
311122101200020010
43332031211302
5114024441432
610340155350
71436301264
oct376154562
9148350203
1066640242
1134686889
121a398b56
1310a634c6
148bc9b34
155cb53cc
hex3f8d972

66640242 has 16 divisors (see below), whose sum is σ = 134527392. Its totient is φ = 22005600.

The previous prime is 66640237. The next prime is 66640253. The reversal of 66640242 is 24204666.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51259 + ... + 52542.

It is an arithmetic number, because the mean of its divisors is an integer number (8407962).

Almost surely, 266640242 is an apocalyptic number.

66640242 is an abundant number, since it is smaller than the sum of its proper divisors (67887150).

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

66640242 is a wasteful number, since it uses less digits than its factorization.

66640242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103913.

The product of its (nonzero) digits is 13824, while the sum is 30.

The square root of 66640242 is about 8163.3474751477. The cubic root of 66640242 is about 405.4265525716.

The spelling of 66640242 in words is "sixty-six million, six hundred forty thousand, two hundred forty-two".

Divisors: 1 2 3 6 107 214 321 642 103801 207602 311403 622806 11106707 22213414 33320121 66640242