66667400 has 24 divisors (see below), whose sum is σ = 155002170. Its totient is φ = 26666880.

The previous prime is 66667399. The next prime is 66667423. The reversal of 66667400 is 476666.

66667400 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 44970436 + 21696964 = 6706^2 + 4658^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 166469 + ... + 166868.

Almost surely, 2^66667400 is an apocalyptic number.

It is an amenable number.

66667400 is an abundant number, since it is smaller than the sum of its proper divisors (88334770).

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

66667400 is a wasteful number, since it uses less digits than its factorization.

66667400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333353 (or 333344 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 35.

The square root of 66667400 is about 8165.0107164657. The cubic root of 66667400 is about 405.4816197933.

The spelling of 66667400 in words is "sixty-six million, six hundred sixty-seven thousand, four hundred".