51005428 has 6 divisors (see below), whose sum is σ = 89259506. Its totient is φ = 25502712.

The previous prime is 51005393. The next prime is 51005429. The reversal of 51005428 is 82450015.

51005428 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 50296464 + 708964 = 7092^2 + 842^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51005429) 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, 6375675 + ... + 6375682.

Almost surely, 2^51005428 is an apocalyptic number.

It is an amenable number.

51005428 is a deficient number, since it is larger than the sum of its proper divisors (38254078).

51005428 is a wasteful number, since it uses less digits than its factorization.

51005428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12751361 (or 12751359 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 51005428 is about 7141.8084544463. The cubic root of 51005428 is about 370.8561329022.

The spelling of 51005428 in words is "fifty-one million, five thousand, four hundred twenty-eight".