51493678 has 4 divisors (see below), whose sum is σ = 77240520. Its totient is φ = 25746838.

The previous prime is 51493649. The next prime is 51493681. The reversal of 51493678 is 87639415.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87639415 = 5 ⋅17527883.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12873418 + ... + 12873421.

It is an arithmetic number, because the mean of its divisors is an integer number (19310130).

Almost surely, 2^51493678 is an apocalyptic number.

51493678 is a deficient number, since it is larger than the sum of its proper divisors (25746842).

51493678 is a wasteful number, since it uses less digits than its factorization.

51493678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25746841.

The product of its digits is 181440, while the sum is 43.

The square root of 51493678 is about 7175.9095590733. The cubic root of 51493678 is about 372.0357184264.

The spelling of 51493678 in words is "fifty-one million, four hundred ninety-three thousand, six hundred seventy-eight".