66239287 has 16 divisors (see below), whose sum is σ = 71497152. Its totient is φ = 61205760.

The previous prime is 66239279. The next prime is 66239297. The reversal of 66239287 is 78293266.

It is not a de Polignac number, because 66239287 - 2³ = 66239279 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 (66239207) 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, 235587 + ... + 235867.

It is an arithmetic number, because the mean of its divisors is an integer number (4468572).

Almost surely, 2^66239287 is an apocalyptic number.

66239287 is a deficient number, since it is larger than the sum of its proper divisors (5257865).

66239287 is a wasteful number, since it uses less digits than its factorization.

66239287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 618.

The product of its digits is 217728, while the sum is 43.

The square root of 66239287 is about 8138.7521770846. The cubic root of 66239287 is about 404.6118050372.

The spelling of 66239287 in words is "sixty-six million, two hundred thirty-nine thousand, two hundred eighty-seven".