2778750 has 120 divisors (see below), whose sum is σ = 8528520. Its totient is φ = 648000.

The previous prime is 2778739. The next prime is 2778779. The reversal of 2778750 is 578772.

It is a Curzon number.

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 59 ways as a sum of consecutive naturals, for example, 146241 + ... + 146259.

It is an arithmetic number, because the mean of its divisors is an integer number (71071).

2^2778750 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2778750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4264260).

2778750 is an abundant number, since it is smaller than the sum of its proper divisors (5749770).

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

2778750 is a wasteful number, since it uses less digits than its factorization.

2778750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60 (or 42 counting only the distinct ones).

The product of its (nonzero) digits is 27440, while the sum is 36.

The square root of 2778750 is about 1666.9583078170. The cubic root of 2778750 is about 140.5885090503.

The spelling of 2778750 in words is "two million, seven hundred seventy-eight thousand, seven hundred fifty".