257028130690 has 8 divisors (see below), whose sum is σ = 462650635260. Its totient is φ = 102811252272.

The previous prime is 257028130687. The next prime is 257028130699. The reversal of 257028130690 is 96031820752.

It can be written as a sum of positive squares in 2 ways, for example, as 249587170569 + 7440960121 = 499587^2 + 86261^2 .

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

It is a super-2 number, since 2×257028130690² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (257028130699) 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, 12851406525 + ... + 12851406544.

Almost surely, 2^257028130690 is an apocalyptic number.

257028130690 is a deficient number, since it is larger than the sum of its proper divisors (205622504570).

257028130690 is a wasteful number, since it uses less digits than its factorization.

257028130690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25702813076.

The product of its (nonzero) digits is 181440, while the sum is 43.

The spelling of 257028130690 in words is "two hundred fifty-seven billion, twenty-eight million, one hundred thirty thousand, six hundred ninety".