257698780 has 12 divisors (see below), whose sum is σ = 541167480. Its totient is φ = 103079504.

The previous prime is 257698759. The next prime is 257698789. The reversal of 257698780 is 87896752.

It is a super-2 number, since 2×257698780² = 132817322426976800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257698789) 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 in 3 ways as a sum of consecutive naturals, for example, 6442450 + ... + 6442489.

It is an arithmetic number, because the mean of its divisors is an integer number (45097290).

Almost surely, 2^257698780 is an apocalyptic number.

257698780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

257698780 is an abundant number, since it is smaller than the sum of its proper divisors (283468700).

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

257698780 is a wasteful number, since it uses less digits than its factorization.

257698780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12884948 (or 12884946 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 52.

The square root of 257698780 is about 16052.9990967420. Note that the first 3 decimals coincide. The cubic root of 257698780 is about 636.3618281829.

The spelling of 257698780 in words is "two hundred fifty-seven million, six hundred ninety-eight thousand, seven hundred eighty".