257377987 has 8 divisors (see below), whose sum is σ = 267067440. Its totient is φ = 247742880.

The previous prime is 257377973. The next prime is 257377993. The reversal of 257377987 is 789773752.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 257377987 - 2¹¹ = 257375939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257371987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3808 + ... + 23005.

It is an arithmetic number, because the mean of its divisors is an integer number (33383430).

Almost surely, 2^257377987 is an apocalyptic number.

257377987 is a deficient number, since it is larger than the sum of its proper divisors (9689453).

257377987 is a wasteful number, since it uses less digits than its factorization.

257377987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27173.

The product of its digits is 5186160, while the sum is 55.

The square root of 257377987 is about 16043.0043009406. The cubic root of 257377987 is about 636.0976629357.

The spelling of 257377987 in words is "two hundred fifty-seven million, three hundred seventy-seven thousand, nine hundred eighty-seven".