6888139990 has 32 divisors (see below), whose sum is σ = 12676777344. Its totient is φ = 2693583360.

The previous prime is 6888139987. The next prime is 6888140003. The reversal of 6888139990 is 999318886.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 432570 + ... + 448210.

It is an arithmetic number, because the mean of its divisors is an integer number (396149292).

Almost surely, 2^6888139990 is an apocalyptic number.

6888139990 is a deficient number, since it is larger than the sum of its proper divisors (5788637354).

6888139990 is a wasteful number, since it uses less digits than its factorization.

6888139990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16632.

The product of its (nonzero) digits is 6718464, while the sum is 61.

The square root of 6888139990 is about 82994.8190551675. The cubic root of 6888139990 is about 1902.6868717183.

The spelling of 6888139990 in words is "six billion, eight hundred eighty-eight million, one hundred thirty-nine thousand, nine hundred ninety".