66478867 has 8 divisors (see below), whose sum is σ = 81820256. Its totient is φ = 52598592.

The previous prime is 66478813. The next prime is 66478873. The reversal of 66478867 is 76887466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66478867 - 2¹⁵ = 66446099 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66478897) 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, 365178 + ... + 365359.

It is an arithmetic number, because the mean of its divisors is an integer number (10227532).

Almost surely, 2^66478867 is an apocalyptic number.

66478867 is a deficient number, since it is larger than the sum of its proper divisors (15341389).

66478867 is a wasteful number, since it uses less digits than its factorization.

66478867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 730557.

The product of its digits is 2709504, while the sum is 52.

The square root of 66478867 is about 8153.4573648238. The cubic root of 66478867 is about 405.0990297895.

The spelling of 66478867 in words is "sixty-six million, four hundred seventy-eight thousand, eight hundred sixty-seven".