257120782 has 8 divisors (see below), whose sum is σ = 387044856. Its totient is φ = 128105832.

The previous prime is 257120701. The next prime is 257120783. The reversal of 257120782 is 287021752.

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

It is a super-2 number, since 2×257120782² = 132222193072583048, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257120783) 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, 226573 + ... + 227704.

It is an arithmetic number, because the mean of its divisors is an integer number (48380607).

Almost surely, 2^257120782 is an apocalyptic number.

257120782 is a deficient number, since it is larger than the sum of its proper divisors (129924074).

257120782 is a wasteful number, since it uses less digits than its factorization.

257120782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 454562.

The product of its (nonzero) digits is 15680, while the sum is 34.

The square root of 257120782 is about 16034.9861864612. The cubic root of 257120782 is about 635.8857022694.

The spelling of 257120782 in words is "two hundred fifty-seven million, one hundred twenty thousand, seven hundred eighty-two".