66703888 has 20 divisors (see below), whose sum is σ = 129914428. Its totient is φ = 33177600.

The previous prime is 66703877. The next prime is 66703891. The reversal of 66703888 is 88830766.

66703888 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 39538944 + 27164944 = 6288^2 + 5212^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7713 + ... + 13888.

Almost surely, 2^66703888 is an apocalyptic number.

It is an amenable number.

66703888 is a deficient number, since it is larger than the sum of its proper divisors (63210540).

66703888 is a wasteful number, since it uses less digits than its factorization.

66703888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21802 (or 21796 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 46.

The square root of 66703888 is about 8167.2448230722. The cubic root of 66703888 is about 405.5555815545. Note that the first 4 decimals are identical.

The spelling of 66703888 in words is "sixty-six million, seven hundred three thousand, eight hundred eighty-eight".