257796730 has 8 divisors (see below), whose sum is σ = 464034132. Its totient is φ = 103118688.

The previous prime is 257796709. The next prime is 257796733. The reversal of 257796730 is 37697752.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 257506209 + 290521 = 16047^2 + 539^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (257796733) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12889827 + ... + 12889846.

Almost surely, 2^257796730 is an apocalyptic number.

257796730 is a deficient number, since it is larger than the sum of its proper divisors (206237402).

257796730 is a wasteful number, since it uses less digits than its factorization.

257796730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25779680.

The product of its (nonzero) digits is 555660, while the sum is 46.

The square root of 257796730 is about 16056.0496386876. The cubic root of 257796730 is about 636.4424439382.

The spelling of 257796730 in words is "two hundred fifty-seven million, seven hundred ninety-six thousand, seven hundred thirty".