6639860078 has 8 divisors (see below), whose sum is σ = 9995746872. Its totient is φ = 3307944456.

The previous prime is 6639860077. The next prime is 6639860081. The reversal of 6639860078 is 8700689366.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6639860077) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 5992100 + ... + 5993207.

It is an arithmetic number, because the mean of its divisors is an integer number (1249468359).

Almost surely, 2^6639860078 is an apocalyptic number.

6639860078 is a deficient number, since it is larger than the sum of its proper divisors (3355886794).

6639860078 is a wasteful number, since it uses less digits than its factorization.

6639860078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11985586.

The product of its (nonzero) digits is 2612736, while the sum is 53.

The square root of 6639860078 is about 81485.3365827251. The cubic root of 6639860078 is about 1879.5460725036.

The spelling of 6639860078 in words is "six billion, six hundred thirty-nine million, eight hundred sixty thousand, seventy-eight".