66673520 has 40 divisors (see below), whose sum is σ = 155997456. Its totient is φ = 26500608.

The previous prime is 66673511. The next prime is 66673547. The reversal of 66673520 is 2537666.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10484 + ... + 15596.

Almost surely, 2^66673520 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 66673520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77998728).

66673520 is an abundant number, since it is smaller than the sum of its proper divisors (89323936).

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

66673520 is a wasteful number, since it uses less digits than its factorization.

66673520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5289 (or 5283 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 35.

The square root of 66673520 is about 8165.3854777347. The cubic root of 66673520 is about 405.4940270147.

The spelling of 66673520 in words is "sixty-six million, six hundred seventy-three thousand, five hundred twenty".