51356678 has 4 divisors (see below), whose sum is σ = 77035020. Its totient is φ = 25678338.

The previous prime is 51356633. The next prime is 51356687. The reversal of 51356678 is 87665315.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12839168 + ... + 12839171.

It is an arithmetic number, because the mean of its divisors is an integer number (19258755).

Almost surely, 2^51356678 is an apocalyptic number.

51356678 is a deficient number, since it is larger than the sum of its proper divisors (25678342).

51356678 is a wasteful number, since it uses less digits than its factorization.

51356678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25678341.

The product of its digits is 151200, while the sum is 41.

The square root of 51356678 is about 7166.3573731708. The cubic root of 51356678 is about 371.7054891400.

The spelling of 51356678 in words is "fifty-one million, three hundred fifty-six thousand, six hundred seventy-eight".