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66472719 = 3139159407
BaseRepresentation
bin1111110110010…
…0101100001111
311122002011102120
43331210230033
5114004111334
610332424023
71435003005
oct375445417
9148064376
1066472719
1134581a35
121a318013
1310a05191
148b84a75
155c80949
hex3f64b0f

66472719 has 8 divisors (see below), whose sum is σ = 89268480. Its totient is φ = 43996056.

The previous prime is 66472687. The next prime is 66472723. The reversal of 66472719 is 91727466.

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

It is not a de Polignac number, because 66472719 - 25 = 66472687 is a prime.

It is a super-2 number, since 2×664727192 = 8837244742505922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66472739) 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, 79287 + ... + 80120.

It is an arithmetic number, because the mean of its divisors is an integer number (11158560).

Almost surely, 266472719 is an apocalyptic number.

66472719 is a deficient number, since it is larger than the sum of its proper divisors (22795761).

66472719 is a wasteful number, since it uses less digits than its factorization.

66472719 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159549.

The product of its digits is 127008, while the sum is 42.

The square root of 66472719 is about 8153.0803381299. The cubic root of 66472719 is about 405.0865414819.

The spelling of 66472719 in words is "sixty-six million, four hundred seventy-two thousand, seven hundred nineteen".

Divisors: 1 3 139 417 159407 478221 22157573 66472719