257251398428 has 12 divisors (see below), whose sum is σ = 451941660912. Its totient is φ = 128125209600.

The previous prime is 257251398427. The next prime is 257251398487. The reversal of 257251398428 is 824893152752.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257251398421) 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, 125121248 + ... + 125123303.

It is an arithmetic number, because the mean of its divisors is an integer number (37661805076).

Almost surely, 2^257251398428 is an apocalyptic number.

It is an amenable number.

257251398428 is a deficient number, since it is larger than the sum of its proper divisors (194690262484).

257251398428 is a wasteful number, since it uses less digits than its factorization.

257251398428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250244812 (or 250244810 counting only the distinct ones).

The product of its digits is 9676800, while the sum is 56.

The spelling of 257251398428 in words is "two hundred fifty-seven billion, two hundred fifty-one million, three hundred ninety-eight thousand, four hundred twenty-eight".