66877447 has 32 divisors (see below), whose sum is σ = 86073344. Its totient is φ = 50544000.

The previous prime is 66877409. The next prime is 66877471. The reversal of 66877447 is 74477866.

It is a de Polignac number, because none of the positive numbers 2^k-66877447 is a prime.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 66877447.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66872447) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 425893 + ... + 426049.

It is an arithmetic number, because the mean of its divisors is an integer number (2689792).

Almost surely, 2^66877447 is an apocalyptic number.

66877447 is a deficient number, since it is larger than the sum of its proper divisors (19195897).

66877447 is a wasteful number, since it uses less digits than its factorization.

66877447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359.

The product of its digits is 1580544, while the sum is 49.

The square root of 66877447 is about 8177.8632294750. The cubic root of 66877447 is about 405.9070196453.

The spelling of 66877447 in words is "sixty-six million, eight hundred seventy-seven thousand, four hundred forty-seven".