66890604 has 48 divisors (see below), whose sum is σ = 170916480. Its totient is φ = 20192640.

The previous prime is 66890599. The next prime is 66890627. The reversal of 66890604 is 40609866.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40507 + ... + 42125.

It is an arithmetic number, because the mean of its divisors is an integer number (3560760).

Almost surely, 2^66890604 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 66890604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85458240).

66890604 is an abundant number, since it is smaller than the sum of its proper divisors (104025876).

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

66890604 is a wasteful number, since it uses less digits than its factorization.

66890604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1950 (or 1948 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 66890604 is about 8178.6676176502. The cubic root of 66890604 is about 405.9336363336.

The spelling of 66890604 in words is "sixty-six million, eight hundred ninety thousand, six hundred four".