257294339628 has 12 divisors (see below), whose sum is σ = 600353459160. Its totient is φ = 85764779872.

The previous prime is 257294339563. The next prime is 257294339629. The reversal of 257294339628 is 826933492752.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×257294339628² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (257294339629) 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, 10720597473 + ... + 10720597496.

It is an arithmetic number, because the mean of its divisors is an integer number (50029454930).

Almost surely, 2^257294339628 is an apocalyptic number.

It is an amenable number.

257294339628 is an abundant number, since it is smaller than the sum of its proper divisors (343059119532).

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

257294339628 is a wasteful number, since it uses less digits than its factorization.

257294339628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21441194976 (or 21441194974 counting only the distinct ones).

The product of its digits is 39191040, while the sum is 60.

The spelling of 257294339628 in words is "two hundred fifty-seven billion, two hundred ninety-four million, three hundred thirty-nine thousand, six hundred twenty-eight".