2102778 has 24 divisors (see below), whose sum is σ = 4586868. Its totient is φ = 696192.

The previous prime is 2102777. The next prime is 2102783. The reversal of 2102778 is 8772012.

It can be written as a sum of positive squares in 2 ways, for example, as 1814409 + 288369 = 1347^2 + 537^2 .

It is not an unprimeable number, because it can be changed into a prime (2102777) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3250 + ... + 3842.

2^2102778 is an apocalyptic number.

2102778 is an abundant number, since it is smaller than the sum of its proper divisors (2484090).

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

2102778 is a wasteful number, since it uses less digits than its factorization.

2102778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 798 (or 795 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

The square root of 2102778 is about 1450.0958589004. The cubic root of 2102778 is about 128.1143590608.

The spelling of 2102778 in words is "two million, one hundred two thousand, seven hundred seventy-eight".