66000078 has 24 divisors (see below), whose sum is σ = 146489616. Its totient is φ = 21463200.

The previous prime is 66000073. The next prime is 66000083. The reversal of 66000078 is 87000066.

It is an interprime number because it is at equal distance from previous prime (66000073) and next prime (66000083).

66000078 is a modest number, since divided by 78 gives 66 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66000071) 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, 43978 + ... + 45453.

It is an arithmetic number, because the mean of its divisors is an integer number (6103734).

Almost surely, 2^66000078 is an apocalyptic number.

66000078 is an abundant number, since it is smaller than the sum of its proper divisors (80489538).

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

66000078 is a wasteful number, since it uses less digits than its factorization.

66000078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89480 (or 89477 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 66000078 is about 8124.0432052027. The cubic root of 66000078 is about 404.1241612625.

The spelling of 66000078 in words is "sixty-six million, seventy-eight", and thus it is an aban number and an uban number.