2557679 has 4 divisors (see below), whose sum is σ = 2561880. Its totient is φ = 2553480.

The previous prime is 2557673. The next prime is 2557691. The reversal of 2557679 is 9767552.

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

It is a cyclic number.

It is not a de Polignac number, because 2557679 - 2⁴ = 2557663 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 (2557673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 992 + ... + 2469.

It is an arithmetic number, because the mean of its divisors is an integer number (640470).

2^2557679 is an apocalyptic number.

2557679 is a deficient number, since it is larger than the sum of its proper divisors (4201).

2557679 is an equidigital number, since it uses as much as digits as its factorization.

2557679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4200.

The product of its digits is 132300, while the sum is 41.

The square root of 2557679 is about 1599.2745230260. The cubic root of 2557679 is about 136.7567210027.

The spelling of 2557679 in words is "two million, five hundred fifty-seven thousand, six hundred seventy-nine".