66674646 has 48 divisors (see below), whose sum is σ = 154440000. Its totient is φ = 20715264.

The previous prime is 66674627. The next prime is 66674687. The reversal of 66674646 is 64647666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32355 + ... + 34353.

It is an arithmetic number, because the mean of its divisors is an integer number (3217500).

Almost surely, 2^66674646 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66674646, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77220000).

66674646 is an abundant number, since it is smaller than the sum of its proper divisors (87765354).

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

66674646 is a wasteful number, since it uses less digits than its factorization.

66674646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2133 (or 2130 counting only the distinct ones).

The product of its digits is 870912, while the sum is 45.

The square root of 66674646 is about 8165.4544270359. The cubic root of 66674646 is about 405.4963096986.

The spelling of 66674646 in words is "sixty-six million, six hundred seventy-four thousand, six hundred forty-six".