66478404 has 48 divisors (see below), whose sum is σ = 157853696. Its totient is φ = 21772800.

The previous prime is 66478393. The next prime is 66478417. The reversal of 66478404 is 40487466.

66478404 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 275724 + ... + 275964.

Almost surely, 2^66478404 is an apocalyptic number.

It is an amenable number.

66478404 is an abundant number, since it is smaller than the sum of its proper divisors (91375292).

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

66478404 is a wasteful number, since it uses less digits than its factorization.

66478404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 556 (or 554 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 39.

The square root of 66478404 is about 8153.4289719111. The cubic root of 66478404 is about 405.0980893338.

It can be divided in two parts, 6647 and 8404, that added together give a palindrome (15051).

The spelling of 66478404 in words is "sixty-six million, four hundred seventy-eight thousand, four hundred four".