51287078 has 4 divisors (see below), whose sum is σ = 76930620. Its totient is φ = 25643538.

The previous prime is 51287059. The next prime is 51287087. The reversal of 51287078 is 87078215.

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, 12821768 + ... + 12821771.

It is an arithmetic number, because the mean of its divisors is an integer number (19232655).

Almost surely, 2^51287078 is an apocalyptic number.

51287078 is a deficient number, since it is larger than the sum of its proper divisors (25643542).

51287078 is a wasteful number, since it uses less digits than its factorization.

51287078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25643541.

The product of its (nonzero) digits is 31360, while the sum is 38.

The square root of 51287078 is about 7161.4997032744. The cubic root of 51287078 is about 371.5374980188.

The spelling of 51287078 in words is "fifty-one million, two hundred eighty-seven thousand, seventy-eight".