66863782 has 4 divisors (see below), whose sum is σ = 100295676. Its totient is φ = 33431890.

The previous prime is 66863779. The next prime is 66863803. The reversal of 66863782 is 28736866.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 28736866 = 2 ⋅14368433.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16715944 + ... + 16715947.

It is an arithmetic number, because the mean of its divisors is an integer number (25073919).

Almost surely, 2^66863782 is an apocalyptic number.

66863782 is a deficient number, since it is larger than the sum of its proper divisors (33431894).

66863782 is a wasteful number, since it uses less digits than its factorization.

66863782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33431893.

The product of its digits is 580608, while the sum is 46.

The square root of 66863782 is about 8177.0276995984. The cubic root of 66863782 is about 405.8793715741.

The spelling of 66863782 in words is "sixty-six million, eight hundred sixty-three thousand, seven hundred eighty-two".