6620678938 has 16 divisors (see below), whose sum is σ = 10368259200. Its totient is φ = 3164744176.

The previous prime is 6620678921. The next prime is 6620678969. The reversal of 6620678938 is 8398760266.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52731 + ... + 126577.

It is an arithmetic number, because the mean of its divisors is an integer number (648016200).

Almost surely, 2^6620678938 is an apocalyptic number.

6620678938 is a deficient number, since it is larger than the sum of its proper divisors (3747580262).

6620678938 is a wasteful number, since it uses less digits than its factorization.

6620678938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75821.

The product of its (nonzero) digits is 5225472, while the sum is 55.

The square root of 6620678938 is about 81367.5545779766. The cubic root of 6620678938 is about 1877.7344576449.

The spelling of 6620678938 in words is "six billion, six hundred twenty million, six hundred seventy-eight thousand, nine hundred thirty-eight".