51473728 has 28 divisors (see below), whose sum is σ = 102755700. Its totient is φ = 25582592.

The previous prime is 51473713. The next prime is 51473767. The reversal of 51473728 is 82737415.

It can be written as a sum of positive squares in 2 ways, for example, as 48888064 + 2585664 = 6992^2 + 1608^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8748 + ... + 13396.

Almost surely, 2^51473728 is an apocalyptic number.

It is an amenable number.

51473728 is a deficient number, since it is larger than the sum of its proper divisors (51281972).

51473728 is a wasteful number, since it uses less digits than its factorization.

51473728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4834 (or 4824 counting only the distinct ones).

The product of its digits is 47040, while the sum is 37.

The square root of 51473728 is about 7174.5193567235. The cubic root of 51473728 is about 371.9876667588.

The spelling of 51473728 in words is "fifty-one million, four hundred seventy-three thousand, seven hundred twenty-eight".