51380078 has 4 divisors (see below), whose sum is σ = 77070120. Its totient is φ = 25690038.

The previous prime is 51380059. The next prime is 51380081. The reversal of 51380078 is 87008315.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12845018 + ... + 12845021.

It is an arithmetic number, because the mean of its divisors is an integer number (19267530).

Almost surely, 2^51380078 is an apocalyptic number.

51380078 is a deficient number, since it is larger than the sum of its proper divisors (25690042).

51380078 is a wasteful number, since it uses less digits than its factorization.

51380078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25690041.

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 51380078 is about 7167.9898158410. The cubic root of 51380078 is about 371.7619348194.

The spelling of 51380078 in words is "fifty-one million, three hundred eighty thousand, seventy-eight".