66797478 has 24 divisors (see below), whose sum is σ = 157885416. Its totient is φ = 20241600.

The previous prime is 66797477. The next prime is 66797503. The reversal of 66797478 is 87479766.

It is a super-4 number, since 4×66797478⁴ (a number of 32 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66797477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 168483 + ... + 168878.

It is an arithmetic number, because the mean of its divisors is an integer number (6578559).

Almost surely, 2^66797478 is an apocalyptic number.

66797478 is an abundant number, since it is smaller than the sum of its proper divisors (91087938).

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

66797478 is a wasteful number, since it uses less digits than its factorization.

66797478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337380 (or 337377 counting only the distinct ones).

The product of its digits is 3556224, while the sum is 54.

The square root of 66797478 is about 8172.9724091055. The cubic root of 66797478 is about 405.7451667509.

The spelling of 66797478 in words is "sixty-six million, seven hundred ninety-seven thousand, four hundred seventy-eight".