66886887 has 16 divisors (see below), whose sum is σ = 91845248. Its totient is φ = 43273440.

The previous prime is 66886849. The next prime is 66886903. The reversal of 66886887 is 78868866.

It is not a de Polignac number, because 66886887 - 2⁷ = 66886759 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66886187) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19437 + ... + 22617.

It is an arithmetic number, because the mean of its divisors is an integer number (5740328).

Almost surely, 2^66886887 is an apocalyptic number.

66886887 is a deficient number, since it is larger than the sum of its proper divisors (24958361).

66886887 is a wasteful number, since it uses less digits than its factorization.

66886887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3390.

The product of its digits is 6193152, while the sum is 57.

The square root of 66886887 is about 8178.4403769912. The cubic root of 66886887 is about 405.9261171745.

The spelling of 66886887 in words is "sixty-six million, eight hundred eighty-six thousand, eight hundred eighty-seven".