71783066 has 4 divisors (see below), whose sum is σ = 107674602. Its totient is φ = 35891532.

The previous prime is 71783051. The next prime is 71783111. The reversal of 71783066 is 66038717.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66038717 = 1459 ⋅45263.

It can be written as a sum of positive squares in only one way, i.e., 69239041 + 2544025 = 8321^2 + 1595^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17945765 + ... + 17945768.

Almost surely, 2^71783066 is an apocalyptic number.

71783066 is a deficient number, since it is larger than the sum of its proper divisors (35891536).

71783066 is a wasteful number, since it uses less digits than its factorization.

71783066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35891535.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 71783066 is about 8472.4887724918. The cubic root of 71783066 is about 415.5985286323.

The spelling of 71783066 in words is "seventy-one million, seven hundred eighty-three thousand, sixty-six".