66780378 has 48 divisors (see below), whose sum is σ = 165821760. Its totient is φ = 19027008.

The previous prime is 66780361. The next prime is 66780379. The reversal of 66780378 is 87308766.

It is not an unprimeable number, because it can be changed into a prime (66780379) 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 23 ways as a sum of consecutive naturals, for example, 77313 + ... + 78171.

It is an arithmetic number, because the mean of its divisors is an integer number (3454620).

Almost surely, 2^66780378 is an apocalyptic number.

66780378 is an abundant number, since it is smaller than the sum of its proper divisors (99041382).

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

66780378 is a wasteful number, since it uses less digits than its factorization.

66780378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1491 (or 1488 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The square root of 66780378 is about 8171.9262111206. The cubic root of 66780378 is about 405.7105405210.

The spelling of 66780378 in words is "sixty-six million, seven hundred eighty thousand, three hundred seventy-eight".