2780642 has 8 divisors (see below), whose sum is σ = 4224000. Its totient is φ = 1372644.

The previous prime is 2780641. The next prime is 2780647. The reversal of 2780642 is 2460872.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2780641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8642 + ... + 8957.

It is an arithmetic number, because the mean of its divisors is an integer number (528000).

2^2780642 is an apocalyptic number.

2780642 is a deficient number, since it is larger than the sum of its proper divisors (1443358).

2780642 is a wasteful number, since it uses less digits than its factorization.

2780642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17680.

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 2780642 is about 1667.5257119457. The cubic root of 2780642 is about 140.6204098584.

The spelling of 2780642 in words is "two million, seven hundred eighty thousand, six hundred forty-two".