66881782 has 12 divisors (see below), whose sum is σ = 110272428. Its totient is φ = 30400700.

The previous prime is 66881777. The next prime is 66881831. The reversal of 66881782 is 28718866.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 137944 + ... + 138427.

It is an arithmetic number, because the mean of its divisors is an integer number (9189369).

Almost surely, 2^66881782 is an apocalyptic number.

66881782 is a deficient number, since it is larger than the sum of its proper divisors (43390646).

66881782 is a wasteful number, since it uses less digits than its factorization.

66881782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276395 (or 276384 counting only the distinct ones).

The product of its digits is 258048, while the sum is 46.

The square root of 66881782 is about 8178.1282699650. The cubic root of 66881782 is about 405.9157897614.

The spelling of 66881782 in words is "sixty-six million, eight hundred eighty-one thousand, seven hundred eighty-two".