257155734 has 24 divisors (see below), whose sum is σ = 565319160. Its totient is φ = 77925760.

The previous prime is 257155733. The next prime is 257155777. The reversal of 257155734 is 437551752.

It is a happy number.

It is a super-2 number, since 2×257155734² = 132258143058157512, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 257155692 and 257155701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257155733) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 176379 + ... + 177830.

It is an arithmetic number, because the mean of its divisors is an integer number (23554965).

Almost surely, 2^257155734 is an apocalyptic number.

257155734 is an abundant number, since it is smaller than the sum of its proper divisors (308163426).

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

257155734 is a wasteful number, since it uses less digits than its factorization.

257155734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354236 (or 354225 counting only the distinct ones).

The product of its digits is 147000, while the sum is 39.

The square root of 257155734 is about 16036.0760162828. The cubic root of 257155734 is about 635.9145142410.

The spelling of 257155734 in words is "two hundred fifty-seven million, one hundred fifty-five thousand, seven hundred thirty-four".