257240900 has 72 divisors (see below), whose sum is σ = 641833920. Its totient is φ = 87661440.

The previous prime is 257240899. The next prime is 257240903. The reversal of 257240900 is 9042752.

It is not an unprimeable number, because it can be changed into a prime (257240903) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 124274 + ... + 126326.

It is an arithmetic number, because the mean of its divisors is an integer number (8914360).

Almost surely, 2^257240900 is an apocalyptic number.

257240900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 257240900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (320916960).

257240900 is an abundant number, since it is smaller than the sum of its proper divisors (384593020).

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

257240900 is a wasteful number, since it uses less digits than its factorization.

257240900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2253 (or 2246 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 257240900 is about 16038.7312465793. The cubic root of 257240900 is about 635.9847081750.

The spelling of 257240900 in words is "two hundred fifty-seven million, two hundred forty thousand, nine hundred".