51340778 has 4 divisors (see below), whose sum is σ = 77011170. Its totient is φ = 25670388.

The previous prime is 51340777. The next prime is 51340787. The reversal of 51340778 is 87704315.

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., 28654609 + 22686169 = 5353^2 + 4763^2 .

It is not an unprimeable number, because it can be changed into a prime (51340771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12835193 + ... + 12835196.

Almost surely, 2^51340778 is an apocalyptic number.

51340778 is a deficient number, since it is larger than the sum of its proper divisors (25670392).

51340778 is a wasteful number, since it uses less digits than its factorization.

51340778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25670391.

The product of its (nonzero) digits is 23520, while the sum is 35.

The square root of 51340778 is about 7165.2479370919. The cubic root of 51340778 is about 371.6671252405.

The spelling of 51340778 in words is "fifty-one million, three hundred forty thousand, seven hundred seventy-eight".