66673808 has 40 divisors (see below), whose sum is σ = 134158080. Its totient is φ = 32065920.

The previous prime is 66673807. The next prime is 66673819. The reversal of 66673808 is 80837666.

It is not an unprimeable number, because it can be changed into a prime (66673801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 113291 + ... + 113877.

It is an arithmetic number, because the mean of its divisors is an integer number (3353952).

Almost surely, 2^66673808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66673808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67079040).

66673808 is an abundant number, since it is smaller than the sum of its proper divisors (67484272).

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

66673808 is a wasteful number, since it uses less digits than its factorization.

66673808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 855 (or 849 counting only the distinct ones).

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

The square root of 66673808 is about 8165.4031131353. The cubic root of 66673808 is about 405.4946108652.

The spelling of 66673808 in words is "sixty-six million, six hundred seventy-three thousand, eight hundred eight".