66749008 has 10 divisors (see below), whose sum is σ = 129326234. Its totient is φ = 33374496.

The previous prime is 66748993. The next prime is 66749009. The reversal of 66749008 is 80094766.

It can be written as a sum of positive squares in only one way, i.e., 61027344 + 5721664 = 7812^2 + 2392^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66749009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2085891 + ... + 2085922.

Almost surely, 2^66749008 is an apocalyptic number.

It is an amenable number.

66749008 is a deficient number, since it is larger than the sum of its proper divisors (62577226).

66749008 is a wasteful number, since it uses less digits than its factorization.

66749008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4171821 (or 4171815 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 66749008 is about 8170.0066095445. The cubic root of 66749008 is about 405.6470032295.

The spelling of 66749008 in words is "sixty-six million, seven hundred forty-nine thousand, eight".