2778530680 has 16 divisors (see below), whose sum is σ = 6251694120. Its totient is φ = 1111412256.

The previous prime is 2778530647. The next prime is 2778530701. The reversal of 2778530680 is 860358772.

It is a self number, because there is not a number n which added to its sum of digits gives 2778530680.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34731594 + ... + 34731673.

Almost surely, 2^2778530680 is an apocalyptic number.

2778530680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2778530680 is an abundant number, since it is smaller than the sum of its proper divisors (3473163440).

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

2778530680 is a wasteful number, since it uses less digits than its factorization.

2778530680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69463278 (or 69463274 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 46.

The square root of 2778530680 is about 52711.7698431764. The cubic root of 2778530680 is about 1405.8481018289.

The spelling of 2778530680 in words is "two billion, seven hundred seventy-eight million, five hundred thirty thousand, six hundred eighty".