51257236428 has 30 divisors (see below), whose sum is σ = 133996541756. Its totient is φ = 17085745368.

The previous prime is 51257236423. The next prime is 51257236463. The reversal of 51257236428 is 82463275215.

51257236428 is a `hidden beast` number, since 5 + 1 + 2 + 572 + 36 + 42 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (51257236423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 79100350 + ... + 79100997.

Almost surely, 2^51257236428 is an apocalyptic number.

It is an amenable number.

51257236428 is an abundant number, since it is smaller than the sum of its proper divisors (82739305328).

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

51257236428 is a wasteful number, since it uses less digits than its factorization.

51257236428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158201363 (or 158201352 counting only the distinct ones).

The product of its digits is 806400, while the sum is 45.

The spelling of 51257236428 in words is "fifty-one billion, two hundred fifty-seven million, two hundred thirty-six thousand, four hundred twenty-eight".