66838887 has 6 divisors (see below), whose sum is σ = 96545072. Its totient is φ = 44559252.

The previous prime is 66838879. The next prime is 66838901. The reversal of 66838887 is 78883866.

It is a happy number.

It is not a de Polignac number, because 66838887 - 2³ = 66838879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66838817) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3713263 + ... + 3713280.

Almost surely, 2^66838887 is an apocalyptic number.

66838887 is a deficient number, since it is larger than the sum of its proper divisors (29706185).

66838887 is a wasteful number, since it uses less digits than its factorization.

66838887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7426549 (or 7426546 counting only the distinct ones).

The product of its digits is 3096576, while the sum is 54.

The square root of 66838887 is about 8175.5053054842. The cubic root of 66838887 is about 405.8289924254.

The spelling of 66838887 in words is "sixty-six million, eight hundred thirty-eight thousand, eight hundred eighty-seven".