257645342 has 8 divisors (see below), whose sum is σ = 388127376. Its totient is φ = 128269552.

The previous prime is 257645329. The next prime is 257645347. The reversal of 257645342 is 243546752.

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

It is a super-2 number, since 2×257645342² = 132762244508593928, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 257645296 and 257645305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257645347) 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, 275978 + ... + 276909.

It is an arithmetic number, because the mean of its divisors is an integer number (48515922).

Almost surely, 2^257645342 is an apocalyptic number.

257645342 is a deficient number, since it is larger than the sum of its proper divisors (130482034).

257645342 is a wasteful number, since it uses less digits than its factorization.

257645342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 553122.

The product of its digits is 201600, while the sum is 38.

The square root of 257645342 is about 16051.3345862579. The cubic root of 257645342 is about 636.3178385111.

The spelling of 257645342 in words is "two hundred fifty-seven million, six hundred forty-five thousand, three hundred forty-two".