2061778 has 4 divisors (see below), whose sum is σ = 3092670. Its totient is φ = 1030888.

The previous prime is 2061757. The next prime is 2061793. The reversal of 2061778 is 8771602.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1896129 + 165649 = 1377^2 + 407^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 515443 + ... + 515446.

2^2061778 is an apocalyptic number.

2061778 is a deficient number, since it is larger than the sum of its proper divisors (1030892).

2061778 is a wasteful number, since it uses less digits than its factorization.

2061778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1030891.

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

The square root of 2061778 is about 1435.8892714969. The cubic root of 2061778 is about 127.2762293099.

The spelling of 2061778 in words is "two million, sixty-one thousand, seven hundred seventy-eight".