66779788 has 24 divisors (see below), whose sum is σ = 119614320. Its totient is φ = 32610240.

The previous prime is 66779777. The next prime is 66779807. The reversal of 66779788 is 88797766.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56443 + ... + 57613.

It is an arithmetic number, because the mean of its divisors is an integer number (4983930).

Almost surely, 2^66779788 is an apocalyptic number.

It is an amenable number.

66779788 is a deficient number, since it is larger than the sum of its proper divisors (52834532).

66779788 is a wasteful number, since it uses less digits than its factorization.

66779788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1497 (or 1495 counting only the distinct ones).

The product of its digits is 7112448, while the sum is 58.

The square root of 66779788 is about 8171.8901118407. The cubic root of 66779788 is about 405.7093457093.

The spelling of 66779788 in words is "sixty-six million, seven hundred seventy-nine thousand, seven hundred eighty-eight".