51278026 has 4 divisors (see below), whose sum is σ = 76917042. Its totient is φ = 25639012.

The previous prime is 51278009. The next prime is 51278027. The reversal of 51278026 is 62087215.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 34047225 + 17230801 = 5835^2 + 4151^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (51278027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12819505 + ... + 12819508.

Almost surely, 2^51278026 is an apocalyptic number.

51278026 is a deficient number, since it is larger than the sum of its proper divisors (25639016).

51278026 is a wasteful number, since it uses less digits than its factorization.

51278026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25639015.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 51278026 is about 7160.8676848550. The cubic root of 51278026 is about 371.5156383520.

The spelling of 51278026 in words is "fifty-one million, two hundred seventy-eight thousand, twenty-six".