257677621 has 4 divisors (see below), whose sum is σ = 257913612. Its totient is φ = 257441632.

The previous prime is 257677597. The next prime is 257677627. The reversal of 257677621 is 126776752.

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

It can be written as a sum of positive squares in 2 ways, for example, as 49914225 + 207763396 = 7065^2 + 14414^2 .

It is a cyclic number.

It is not a de Polignac number, because 257677621 - 2¹⁹ = 257153333 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 (257677627) 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, 116350 + ... + 118543.

It is an arithmetic number, because the mean of its divisors is an integer number (64478403).

Almost surely, 2^257677621 is an apocalyptic number.

It is an amenable number.

257677621 is a deficient number, since it is larger than the sum of its proper divisors (235991).

257677621 is a wasteful number, since it uses less digits than its factorization.

257677621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235990.

The product of its digits is 246960, while the sum is 43.

The square root of 257677621 is about 16052.3400474822. The cubic root of 257677621 is about 636.3444110153.

The spelling of 257677621 in words is "two hundred fifty-seven million, six hundred seventy-seven thousand, six hundred twenty-one".