66730688 has 28 divisors (see below), whose sum is σ = 132752592. Its totient is φ = 33281280.

The previous prime is 66730673. The next prime is 66730691. The reversal of 66730688 is 88603766.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30098 + ... + 32238.

It is an arithmetic number, because the mean of its divisors is an integer number (4741164).

Almost surely, 2^66730688 is an apocalyptic number.

It is an amenable number.

66730688 is a deficient number, since it is larger than the sum of its proper divisors (66021904).

66730688 is a wasteful number, since it uses less digits than its factorization.

66730688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2640 (or 2630 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 44.

The square root of 66730688 is about 8168.8853584807. The cubic root of 66730688 is about 405.6098884053.

The spelling of 66730688 in words is "sixty-six million, seven hundred thirty thousand, six hundred eighty-eight".