66287249 has 24 divisors (see below), whose sum is σ = 79781760. Its totient is φ = 54884256.

The previous prime is 66287237. The next prime is 66287281. The reversal of 66287249 is 94278266.

It is a de Polignac number, because none of the positive numbers 2^k-66287249 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 (66187249) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 246287 + ... + 246555.

It is an arithmetic number, because the mean of its divisors is an integer number (3324240).

Almost surely, 2^66287249 is an apocalyptic number.

It is an amenable number.

66287249 is a deficient number, since it is larger than the sum of its proper divisors (13494511).

66287249 is a wasteful number, since it uses less digits than its factorization.

66287249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437 (or 430 counting only the distinct ones).

The product of its digits is 290304, while the sum is 44.

The square root of 66287249 is about 8141.6981643881. The cubic root of 66287249 is about 404.7094374765.

The spelling of 66287249 in words is "sixty-six million, two hundred eighty-seven thousand, two hundred forty-nine".