51421648 has 10 divisors (see below), whose sum is σ = 99629474. Its totient is φ = 25710816.

The previous prime is 51421639. The next prime is 51421649. The reversal of 51421648 is 84612415.

It can be written as a sum of positive squares in only one way, i.e., 39087504 + 12334144 = 6252^2 + 3512^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51421649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1606911 + ... + 1606942.

Almost surely, 2^51421648 is an apocalyptic number.

It is an amenable number.

51421648 is a deficient number, since it is larger than the sum of its proper divisors (48207826).

51421648 is a wasteful number, since it uses less digits than its factorization.

51421648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3213861 (or 3213855 counting only the distinct ones).

The product of its digits is 7680, while the sum is 31.

The square root of 51421648 is about 7170.8889267649. Note that the first 3 decimals coincide. The cubic root of 51421648 is about 371.8621680764.

The spelling of 51421648 in words is "fifty-one million, four hundred twenty-one thousand, six hundred forty-eight".