51278 has 4 divisors (see below), whose sum is σ = 76920. Its totient is φ = 25638.

The previous prime is 51263. The next prime is 51283. The reversal of 51278 is 87215.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87215 = 5 ⋅17443.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12818 + ... + 12821.

It is an arithmetic number, because the mean of its divisors is an integer number (19230).

2⁵¹²⁷⁸ is an apocalyptic number.

51278 is a deficient number, since it is larger than the sum of its proper divisors (25642).

51278 is a wasteful number, since it uses less digits than its factorization.

51278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25641.

The product of its digits is 560, while the sum is 23.

The square root of 51278 is about 226.4464616637. The cubic root of 51278 is about 37.1515575561.

Subtracting 51278 from its reverse (87215), we obtain a cube (35937 = 33³).

The spelling of 51278 in words is "fifty-one thousand, two hundred seventy-eight".