6777722640 has 80 divisors (see below), whose sum is σ = 22627176768. Its totient is φ = 1668361728.

The previous prime is 6777722621. The next prime is 6777722687. The reversal of 6777722640 is 462277776.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 6777722640.

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 15 ways as a sum of consecutive naturals, for example, 1083054 + ... + 1089293.

Almost surely, 2^6777722640 is an apocalyptic number.

6777722640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6777722640 is an abundant number, since it is smaller than the sum of its proper divisors (15849454128).

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

6777722640 is a wasteful number, since it uses less digits than its factorization.

6777722640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2172376 (or 2172370 counting only the distinct ones).

The product of its (nonzero) digits is 1382976, while the sum is 48.

The square root of 6777722640 is about 82326.9253646703. The cubic root of 6777722640 is about 1892.4653251338.

The spelling of 6777722640 in words is "six billion, seven hundred seventy-seven million, seven hundred twenty-two thousand, six hundred forty".