51497728 has 18 divisors (see below), whose sum is σ = 102794804. Its totient is φ = 25748736.

The previous prime is 51497723. The next prime is 51497729. The reversal of 51497728 is 82779415.

It is not an unprimeable number, because it can be changed into a prime (51497723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100326 + ... + 100837.

Almost surely, 2^51497728 is an apocalyptic number.

It is an amenable number.

51497728 is a deficient number, since it is larger than the sum of its proper divisors (51297076).

51497728 is an equidigital number, since it uses as much as digits as its factorization.

51497728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201179 (or 201165 counting only the distinct ones).

The product of its digits is 141120, while the sum is 43.

The square root of 51497728 is about 7176.1917477169. The cubic root of 51497728 is about 372.0454717606.

It can be divided in two parts, 51497 and 728, that added together give a palindrome (52225).

The spelling of 51497728 in words is "fifty-one million, four hundred ninety-seven thousand, seven hundred twenty-eight".