66474378 has 32 divisors (see below), whose sum is σ = 148864320. Its totient is φ = 21986640.

The previous prime is 66474377. The next prime is 66474383. The reversal of 66474378 is 87347466.

It is not an unprimeable number, because it can be changed into a prime (66474371) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2376 + ... + 11772.

It is an arithmetic number, because the mean of its divisors is an integer number (4652010).

Almost surely, 2^66474378 is an apocalyptic number.

66474378 is an abundant number, since it is smaller than the sum of its proper divisors (82389942).

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

66474378 is a wasteful number, since it uses less digits than its factorization.

66474378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9539 (or 9533 counting only the distinct ones).

The product of its digits is 677376, while the sum is 45.

The square root of 66474378 is about 8153.1820781827. The cubic root of 66474378 is about 405.0899114508.

It can be divided in two parts, 6647 and 4378, that added together give a square (11025 = 105²).

The spelling of 66474378 in words is "sixty-six million, four hundred seventy-four thousand, three hundred seventy-eight".