6670728887 has 4 divisors (see below), whose sum is σ = 6729762000. Its totient is φ = 6611695776.

The previous prime is 6670728851. The next prime is 6670728899. The reversal of 6670728887 is 7888270766.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6670728887 - 2¹⁰ = 6670727863 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 (6670728587) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29516387 + ... + 29516612.

It is an arithmetic number, because the mean of its divisors is an integer number (1682440500).

Almost surely, 2^6670728887 is an apocalyptic number.

6670728887 is a deficient number, since it is larger than the sum of its proper divisors (59033113).

6670728887 is a wasteful number, since it uses less digits than its factorization.

6670728887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59033112.

The product of its (nonzero) digits is 12644352, while the sum is 59.

The square root of 6670728887 is about 81674.5302220956. The cubic root of 6670728887 is about 1882.4542497143.

The spelling of 6670728887 in words is "six billion, six hundred seventy million, seven hundred twenty-eight thousand, eight hundred eighty-seven".