2780678 has 4 divisors (see below), whose sum is σ = 4171020. Its totient is φ = 1390338.

The previous prime is 2780671. The next prime is 2780683. The reversal of 2780678 is 8760872.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2780671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695168 + ... + 695171.

It is an arithmetic number, because the mean of its divisors is an integer number (1042755).

2^2780678 is an apocalyptic number.

2780678 is a deficient number, since it is larger than the sum of its proper divisors (1390342).

2780678 is a wasteful number, since it uses less digits than its factorization.

2780678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1390341.

The product of its (nonzero) digits is 37632, while the sum is 38.

The square root of 2780678 is about 1667.5365063470. The cubic root of 2780678 is about 140.6210167102.

The spelling of 2780678 in words is "two million, seven hundred eighty thousand, six hundred seventy-eight".