66748768 has 12 divisors (see below), whose sum is σ = 131411700. Its totient is φ = 33374368.

The previous prime is 66748757. The next prime is 66748793. The reversal of 66748768 is 86784766.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1042918 + ... + 1042981.

It is an arithmetic number, because the mean of its divisors is an integer number (10950975).

Almost surely, 2^66748768 is an apocalyptic number.

It is an amenable number.

66748768 is a deficient number, since it is larger than the sum of its proper divisors (64662932).

66748768 is a wasteful number, since it uses less digits than its factorization.

66748768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2085909 (or 2085901 counting only the distinct ones).

The product of its digits is 2709504, while the sum is 52.

The square root of 66748768 is about 8169.9919216606. The cubic root of 66748768 is about 405.6465170530.

The spelling of 66748768 in words is "sixty-six million, seven hundred forty-eight thousand, seven hundred sixty-eight".