66672287 has 16 divisors (see below), whose sum is σ = 74734080. Its totient is φ = 58968000.

The previous prime is 66672269. The next prime is 66672401. The reversal of 66672287 is 78227666.

It is a cyclic number.

It is not a de Polignac number, because 66672287 - 2⁶ = 66672223 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 (66672217) 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, 62912 + ... + 63962.

It is an arithmetic number, because the mean of its divisors is an integer number (4670880).

Almost surely, 2^66672287 is an apocalyptic number.

66672287 is a deficient number, since it is larger than the sum of its proper divisors (8061793).

66672287 is a wasteful number, since it uses less digits than its factorization.

66672287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1214.

The product of its digits is 338688, while the sum is 44.

The square root of 66672287 is about 8165.3099757450. The cubic root of 66672287 is about 405.4915273856.

The spelling of 66672287 in words is "sixty-six million, six hundred seventy-two thousand, two hundred eighty-seven".