51438863328 has 48 divisors (see below), whose sum is σ = 135357258960. Its totient is φ = 17104352256.

The previous prime is 51438863327. The next prime is 51438863339. The reversal of 51438863328 is 82336883415.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51438863327) 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 7 ways as a sum of consecutive naturals, for example, 615775 + ... + 694302.

It is an arithmetic number, because the mean of its divisors is an integer number (2819942895).

Almost surely, 2^51438863328 is an apocalyptic number.

It is an amenable number.

51438863328 is an abundant number, since it is smaller than the sum of its proper divisors (83918395632).

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

51438863328 is a wasteful number, since it uses less digits than its factorization.

51438863328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1310499 (or 1310491 counting only the distinct ones).

The product of its digits is 3317760, while the sum is 51.

The spelling of 51438863328 in words is "fifty-one billion, four hundred thirty-eight million, eight hundred sixty-three thousand, three hundred twenty-eight".