257402380 has 24 divisors (see below), whose sum is σ = 547952832. Its totient is φ = 101549952.

The previous prime is 257402357. The next prime is 257402381. The reversal of 257402380 is 83204752.

It is not an unprimeable number, because it can be changed into a prime (257402381) 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, 86692 + ... + 89611.

It is an arithmetic number, because the mean of its divisors is an integer number (22831368).

Almost surely, 2^257402380 is an apocalyptic number.

257402380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

257402380 is an abundant number, since it is smaller than the sum of its proper divisors (290550452).

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

257402380 is a wasteful number, since it uses less digits than its factorization.

257402380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176385 (or 176383 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 257402380 is about 16043.7645208349. The cubic root of 257402380 is about 636.1177576872.

The spelling of 257402380 in words is "two hundred fifty-seven million, four hundred two thousand, three hundred eighty".