257783028 has 12 divisors (see below), whose sum is σ = 601493760. Its totient is φ = 85927672.

The previous prime is 257783027. The next prime is 257783063. The reversal of 257783028 is 820387752.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257783021) 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, 10740948 + ... + 10740971.

It is an arithmetic number, because the mean of its divisors is an integer number (50124480).

Almost surely, 2^257783028 is an apocalyptic number.

It is an amenable number.

257783028 is an abundant number, since it is smaller than the sum of its proper divisors (343710732).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

257783028 is a wasteful number, since it uses less digits than its factorization.

257783028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21481926 (or 21481924 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 42.

The square root of 257783028 is about 16055.6229402661. The cubic root of 257783028 is about 636.4311680144.

The spelling of 257783028 in words is "two hundred fifty-seven million, seven hundred eighty-three thousand, twenty-eight".