66047478 has 16 divisors (see below), whose sum is σ = 150965760. Its totient is φ = 18870696.

The previous prime is 66047473. The next prime is 66047489. The reversal of 66047478 is 87474066.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 1572559 = 66047478 / (6 + 6 + 0 + 4 + 7 + 4 + 7 + 8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66047473) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 786238 + ... + 786321.

It is an arithmetic number, because the mean of its divisors is an integer number (9435360).

Almost surely, 2^66047478 is an apocalyptic number.

66047478 is an abundant number, since it is smaller than the sum of its proper divisors (84918282).

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

66047478 is a wasteful number, since it uses less digits than its factorization.

66047478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1572571.

The product of its (nonzero) digits is 225792, while the sum is 42.

The square root of 66047478 is about 8126.9599482217. The cubic root of 66047478 is about 404.2208828723.

The spelling of 66047478 in words is "sixty-six million, forty-seven thousand, four hundred seventy-eight".