66886078 has 12 divisors (see below), whose sum is σ = 116709552. Its totient is φ = 28665420.

The previous prime is 66886069. The next prime is 66886097. The reversal of 66886078 is 87068866.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 341158 + ... + 341353.

It is an arithmetic number, because the mean of its divisors is an integer number (9725796).

Almost surely, 2^66886078 is an apocalyptic number.

66886078 is a deficient number, since it is larger than the sum of its proper divisors (49823474).

66886078 is a wasteful number, since it uses less digits than its factorization.

66886078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 682527 (or 682520 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 49.

The square root of 66886078 is about 8178.3909175338. The cubic root of 66886078 is about 405.9244806029.

The spelling of 66886078 in words is "sixty-six million, eight hundred eighty-six thousand, seventy-eight".