2780057 has 4 divisors (see below), whose sum is σ = 3177216. Its totient is φ = 2382900.

The previous prime is 2780053. The next prime is 2780077. The reversal of 2780057 is 7500872.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2780057 - 2² = 2780053 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2780053) 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, 198569 + ... + 198582.

It is an arithmetic number, because the mean of its divisors is an integer number (794304).

2^2780057 is an apocalyptic number.

It is an amenable number.

2780057 is a deficient number, since it is larger than the sum of its proper divisors (397159).

2780057 is an equidigital number, since it uses as much as digits as its factorization.

2780057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397158.

The product of its (nonzero) digits is 3920, while the sum is 29.

The square root of 2780057 is about 1667.3502931298. The cubic root of 2780057 is about 140.6105477823.

The spelling of 2780057 in words is "two million, seven hundred eighty thousand, fifty-seven".