66887858 has 4 divisors (see below), whose sum is σ = 100331790. Its totient is φ = 33443928.

The previous prime is 66887857. The next prime is 66887867. The reversal of 66887858 is 85878866.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 65820769 + 1067089 = 8113^2 + 1033^2 .

It is not an unprimeable number, because it can be changed into a prime (66887857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16721963 + ... + 16721966.

Almost surely, 2^66887858 is an apocalyptic number.

66887858 is a deficient number, since it is larger than the sum of its proper divisors (33443932).

66887858 is a wasteful number, since it uses less digits than its factorization.

66887858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33443931.

The product of its digits is 5160960, while the sum is 56.

The square root of 66887858 is about 8178.4997401724. The cubic root of 66887858 is about 405.9280814477.

The spelling of 66887858 in words is "sixty-six million, eight hundred eighty-seven thousand, eight hundred fifty-eight".