2778061 has 8 divisors (see below), whose sum is σ = 3263904. Its totient is φ = 2331120.

The previous prime is 2778049. The next prime is 2778067. The reversal of 2778061 is 1608772.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2778061 - 2¹¹ = 2776013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2778067) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9571 + ... + 9856.

It is an arithmetic number, because the mean of its divisors is an integer number (407988).

2^2778061 is an apocalyptic number.

It is an amenable number.

2778061 is a deficient number, since it is larger than the sum of its proper divisors (485843).

2778061 is a wasteful number, since it uses less digits than its factorization.

2778061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19451.

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 2778061 is about 1666.7516311676. The cubic root of 2778061 is about 140.5768882987.

It can be divided in two parts, 277 and 8061, that added together give a palindrome (8338).

The spelling of 2778061 in words is "two million, seven hundred seventy-eight thousand, sixty-one".