6891278438 has 8 divisors (see below), whose sum is σ = 11276637480. Its totient is φ = 3132399280.

The previous prime is 6891278431. The next prime is 6891278479. The reversal of 6891278438 is 8348721986.

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 (6891278431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156619943 + ... + 156619986.

It is an arithmetic number, because the mean of its divisors is an integer number (1409579685).

Almost surely, 2^6891278438 is an apocalyptic number.

6891278438 is a deficient number, since it is larger than the sum of its proper divisors (4385359042).

6891278438 is a wasteful number, since it uses less digits than its factorization.

6891278438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313239942.

The product of its digits is 4644864, while the sum is 56.

The square root of 6891278438 is about 83013.7243954275. The cubic root of 6891278438 is about 1902.9758020204.

The spelling of 6891278438 in words is "six billion, eight hundred ninety-one million, two hundred seventy-eight thousand, four hundred thirty-eight".