51421688 has 32 divisors (see below), whose sum is σ = 98010000. Its totient is φ = 25290240.

The previous prime is 51421687. The next prime is 51421703. The reversal of 51421688 is 88612415.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51421687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 213248 + ... + 213488.

Almost surely, 2^51421688 is an apocalyptic number.

It is an amenable number.

51421688 is a deficient number, since it is larger than the sum of its proper divisors (46588312).

51421688 is a wasteful number, since it uses less digits than its factorization.

51421688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 575 (or 571 counting only the distinct ones).

The product of its digits is 15360, while the sum is 35.

The square root of 51421688 is about 7170.8917158189. The cubic root of 51421688 is about 371.8622644981.

The spelling of 51421688 in words is "fifty-one million, four hundred twenty-one thousand, six hundred eighty-eight".