66747688 has 16 divisors (see below), whose sum is σ = 143030880. Its totient is φ = 28606128.

The previous prime is 66747649. The next prime is 66747697. The reversal of 66747688 is 88674766.

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, 595906 + ... + 596017.

It is an arithmetic number, because the mean of its divisors is an integer number (8939430).

Almost surely, 2^66747688 is an apocalyptic number.

It is an amenable number.

66747688 is an abundant number, since it is smaller than the sum of its proper divisors (76283192).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66747688 is a wasteful number, since it uses less digits than its factorization.

66747688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1191936 (or 1191932 counting only the distinct ones).

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

The square root of 66747688 is about 8169.9258258567. The cubic root of 66747688 is about 405.6443292443.

The spelling of 66747688 in words is "sixty-six million, seven hundred forty-seven thousand, six hundred eighty-eight".