2820556278 has 12 divisors (see below), whose sum is σ = 6111205308. Its totient is φ = 940185420.

The previous prime is 2820556253. The next prime is 2820556303. The reversal of 2820556278 is 8726550282.

2820556278 is a `hidden beast` number, since 2 + 8 + 20 + 556 + 2 + 78 = 666.

2820556278 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (2820556253) and next prime (2820556303).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 78348768 + ... + 78348803.

It is an arithmetic number, because the mean of its divisors is an integer number (509267109).

Almost surely, 2^2820556278 is an apocalyptic number.

2820556278 is an abundant number, since it is smaller than the sum of its proper divisors (3290649030).

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

2820556278 is a wasteful number, since it uses less digits than its factorization.

2820556278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156697579 (or 156697576 counting only the distinct ones).

The product of its (nonzero) digits is 537600, while the sum is 45.

The square root of 2820556278 is about 53108.9095915177. The cubic root of 2820556278 is about 1412.9005358800.

The spelling of 2820556278 in words is "two billion, eight hundred twenty million, five hundred fifty-six thousand, two hundred seventy-eight".