257528380 has 24 divisors (see below), whose sum is σ = 554001840. Its totient is φ = 100498560.

The previous prime is 257528329. The next prime is 257528389. The reversal of 257528380 is 83825752.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257528389) 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, 156210 + ... + 157849.

It is an arithmetic number, because the mean of its divisors is an integer number (23083410).

Almost surely, 2^257528380 is an apocalyptic number.

257528380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

257528380 is an abundant number, since it is smaller than the sum of its proper divisors (296473460).

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

257528380 is a wasteful number, since it uses less digits than its factorization.

257528380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314109 (or 314107 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 40.

The square root of 257528380 is about 16047.6907996135. The cubic root of 257528380 is about 636.2215352344.

The spelling of 257528380 in words is "two hundred fifty-seven million, five hundred twenty-eight thousand, three hundred eighty".