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66575972 = 22311373919
BaseRepresentation
bin1111110111110…
…1111001100100
311122021102001202
43331331321210
5114020412342
610334542032
71435613021
oct375757144
9148242052
1066575972
1134642571
121a367918
1310a40188
148bb0548
155ca1332
hex3f7de64

66575972 has 24 divisors (see below), whose sum is σ = 121175040. Its totient is φ = 31970880.

The previous prime is 66575969. The next prime is 66575983. The reversal of 66575972 is 27957566.

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, 15029 + ... + 18947.

It is an arithmetic number, because the mean of its divisors is an integer number (5048960).

Almost surely, 266575972 is an apocalyptic number.

66575972 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

66575972 is a deficient number, since it is larger than the sum of its proper divisors (54599068).

66575972 is a wasteful number, since it uses less digits than its factorization.

66575972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4091 (or 4089 counting only the distinct ones).

The product of its digits is 793800, while the sum is 47.

The square root of 66575972 is about 8159.4100276920. The cubic root of 66575972 is about 405.2961751655.

The spelling of 66575972 in words is "sixty-six million, five hundred seventy-five thousand, nine hundred seventy-two".

Divisors: 1 2 4 31 62 124 137 274 548 3919 4247 7838 8494 15676 16988 121489 242978 485956 536903 1073806 2147612 16643993 33287986 66575972