51478637438 has 64 divisors (see below), whose sum is σ = 81047070720. Its totient is φ = 24507974400.

The previous prime is 51478637437. The next prime is 51478637459. The reversal of 51478637438 is 83473687415.

It is a happy number.

It is a super-3 number, since 3×51478637438³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51478637437) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 183197858 + ... + 183198138.

It is an arithmetic number, because the mean of its divisors is an integer number (1266360480).

Almost surely, 2^51478637438 is an apocalyptic number.

51478637438 is a deficient number, since it is larger than the sum of its proper divisors (29568433282).

51478637438 is a wasteful number, since it uses less digits than its factorization.

51478637438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 713.

The product of its digits is 13547520, while the sum is 56.

The spelling of 51478637438 in words is "fifty-one billion, four hundred seventy-eight million, six hundred thirty-seven thousand, four hundred thirty-eight".