66873939 has 16 divisors (see below), whose sum is σ = 102391680. Its totient is φ = 38396160.

The previous prime is 66873931. The next prime is 66873941. The reversal of 66873939 is 93937866.

It is a happy number.

It is not a de Polignac number, because 66873939 - 2³ = 66873931 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66873891 and 66873900.

It is not an unprimeable number, because it can be changed into a prime (66873931) 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, 52702 + ... + 53955.

It is an arithmetic number, because the mean of its divisors is an integer number (6399480).

Almost surely, 2^66873939 is an apocalyptic number.

66873939 is a deficient number, since it is larger than the sum of its proper divisors (35517741).

66873939 is a wasteful number, since it uses less digits than its factorization.

66873939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106690.

The product of its digits is 1469664, while the sum is 51.

The square root of 66873939 is about 8177.6487452079. The cubic root of 66873939 is about 405.8999223513.

The spelling of 66873939 in words is "sixty-six million, eight hundred seventy-three thousand, nine hundred thirty-nine".