66887986 has 16 divisors (see below), whose sum is σ = 109898208. Its totient is φ = 30280000.

The previous prime is 66887981. The next prime is 66888011. The reversal of 66887986 is 68978866.

It is a super-2 number, since 2×66887986² = 8948005342272392, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66887986.

It is not an unprimeable number, because it can be changed into a prime (66887981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 535 + ... + 11578.

It is an arithmetic number, because the mean of its divisors is an integer number (6868638).

Almost surely, 2^66887986 is an apocalyptic number.

66887986 is a deficient number, since it is larger than the sum of its proper divisors (43010222).

66887986 is a wasteful number, since it uses less digits than its factorization.

66887986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12377.

The product of its digits is 6967296, while the sum is 58.

The square root of 66887986 is about 8178.5075655648. The cubic root of 66887986 is about 405.9283403824.

The spelling of 66887986 in words is "sixty-six million, eight hundred eighty-seven thousand, nine hundred eighty-six".