66969078 has 32 divisors (see below), whose sum is σ = 149230080. Its totient is φ = 19860960.

The previous prime is 66969061. The next prime is 66969101. The reversal of 66969078 is 87096966.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 66969078.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7693 + ... + 13896.

It is an arithmetic number, because the mean of its divisors is an integer number (4663440).

Almost surely, 2^66969078 is an apocalyptic number.

66969078 is an abundant number, since it is smaller than the sum of its proper divisors (82261002).

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

66969078 is a wasteful number, since it uses less digits than its factorization.

66969078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21652.

The product of its (nonzero) digits is 979776, while the sum is 51.

The square root of 66969078 is about 8183.4636921050. The cubic root of 66969078 is about 406.0923172504.

The spelling of 66969078 in words is "sixty-six million, nine hundred sixty-nine thousand, seventy-eight".