66943278 has 24 divisors (see below), whose sum is σ = 145304328. Its totient is φ = 22274352.

The previous prime is 66943277. The next prime is 66943301. The reversal of 66943278 is 87234966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66943277) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8001 + ... + 14067.

It is an arithmetic number, because the mean of its divisors is an integer number (6054347).

Almost surely, 2^66943278 is an apocalyptic number.

66943278 is an abundant number, since it is smaller than the sum of its proper divisors (78361050).

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

66943278 is a wasteful number, since it uses less digits than its factorization.

66943278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6688 (or 6685 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The square root of 66943278 is about 8181.8871906181. The cubic root of 66943278 is about 406.0401612014.

The spelling of 66943278 in words is "sixty-six million, nine hundred forty-three thousand, two hundred seventy-eight".