6940878644 has 12 divisors (see below), whose sum is σ = 13881757344. Its totient is φ = 2974662264.

The previous prime is 6940878631. The next prime is 6940878673. The reversal of 6940878644 is 4468780496.

6940878644 is an admirable number.

It is a hoax number, since the sum of its digits (56) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 6940878644.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123944234 + ... + 123944289.

It is an arithmetic number, because the mean of its divisors is an integer number (1156813112).

Almost surely, 2^6940878644 is an apocalyptic number.

It is an amenable number.

6940878644 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6940878644 is a wasteful number, since it uses less digits than its factorization.

6940878644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247888534 (or 247888532 counting only the distinct ones).

The product of its (nonzero) digits is 9289728, while the sum is 56.

The square root of 6940878644 is about 83311.9357835358. The cubic root of 6940878644 is about 1907.5304692108.

The spelling of 6940878644 in words is "six billion, nine hundred forty million, eight hundred seventy-eight thousand, six hundred forty-four".