2778620 has 24 divisors (see below), whose sum is σ = 6284544. Its totient is φ = 1025856.

The previous prime is 2778619. The next prime is 2778647. The reversal of 2778620 is 268772.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 5084 + ... + 5603.

It is an arithmetic number, because the mean of its divisors is an integer number (261856).

2^2778620 is an apocalyptic number.

2778620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2778620 is an abundant number, since it is smaller than the sum of its proper divisors (3505924).

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

2778620 is a wasteful number, since it uses less digits than its factorization.

2778620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10709 (or 10707 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 2778620 is about 1666.9193141841. The cubic root of 2778620 is about 140.5863166027.

The spelling of 2778620 in words is "two million, seven hundred seventy-eight thousand, six hundred twenty".