51920786 has 4 divisors (see below), whose sum is σ = 77881182. Its totient is φ = 25960392.

The previous prime is 51920783. The next prime is 51920797. The reversal of 51920786 is 68702915.

51920786 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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., 51566761 + 354025 = 7181^2 + 595^2 .

It is not an unprimeable number, because it can be changed into a prime (51920783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12980195 + ... + 12980198.

Almost surely, 2^51920786 is an apocalyptic number.

51920786 is a deficient number, since it is larger than the sum of its proper divisors (25960396).

51920786 is a wasteful number, since it uses less digits than its factorization.

51920786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25960395.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 51920786 is about 7205.6079549196. The cubic root of 51920786 is about 373.0614891430.

The spelling of 51920786 in words is "fifty-one million, nine hundred twenty thousand, seven hundred eighty-six".