257421764 has 6 divisors (see below), whose sum is σ = 450488094. Its totient is φ = 128710880.

The previous prime is 257421763. The next prime is 257421793. The reversal of 257421764 is 467124752.

It can be written as a sum of positive squares in only one way, i.e., 214388164 + 43033600 = 14642^2 + 6560^2 .

It is not an unprimeable number, because it can be changed into a prime (257421763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32177717 + ... + 32177724.

It is an arithmetic number, because the mean of its divisors is an integer number (75081349).

Almost surely, 2^257421764 is an apocalyptic number.

It is an amenable number.

257421764 is a deficient number, since it is larger than the sum of its proper divisors (193066330).

257421764 is a wasteful number, since it uses less digits than its factorization.

257421764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64355445 (or 64355443 counting only the distinct ones).

The product of its digits is 94080, while the sum is 38.

The square root of 257421764 is about 16044.3686070845. The cubic root of 257421764 is about 636.1337251608.

The spelling of 257421764 in words is "two hundred fifty-seven million, four hundred twenty-one thousand, seven hundred sixty-four".