257730990 has 32 divisors (see below), whose sum is σ = 674787456. Its totient is φ = 62480160.

The previous prime is 257730983. The next prime is 257731003. The reversal of 257730990 is 99037752.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 390172 + ... + 390831.

It is an arithmetic number, because the mean of its divisors is an integer number (21087108).

Almost surely, 2^257730990 is an apocalyptic number.

257730990 is an abundant number, since it is smaller than the sum of its proper divisors (417056466).

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

257730990 is a wasteful number, since it uses less digits than its factorization.

257730990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 781024.

The product of its (nonzero) digits is 119070, while the sum is 42.

The square root of 257730990 is about 16054.0023047214. The cubic root of 257730990 is about 636.3883402222.

The spelling of 257730990 in words is "two hundred fifty-seven million, seven hundred thirty thousand, nine hundred ninety".