2578257 has 16 divisors (see below), whose sum is σ = 4167360. Its totient is φ = 1562400.

The previous prime is 2578253. The next prime is 2578259. The reversal of 2578257 is 7528752.

It is not a de Polignac number, because 2578257 - 2² = 2578253 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2578253) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4044 + ... + 4637.

It is an arithmetic number, because the mean of its divisors is an integer number (260460).

2^2578257 is an apocalyptic number.

2578257 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

2578257 is a deficient number, since it is larger than the sum of its proper divisors (1589103).

2578257 is a wasteful number, since it uses less digits than its factorization.

2578257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8701 (or 8695 counting only the distinct ones).

The product of its digits is 39200, while the sum is 36.

The square root of 2578257 is about 1605.6951765513. The cubic root of 2578257 is about 137.1225039550.

The spelling of 2578257 in words is "two million, five hundred seventy-eight thousand, two hundred fifty-seven".