51681268 has 6 divisors (see below), whose sum is σ = 90442226. Its totient is φ = 25840632.

The previous prime is 51681263. The next prime is 51681271. The reversal of 51681268 is 86218615.

It can be written as a sum of positive squares in only one way, i.e., 51667344 + 13924 = 7188^2 + 118^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51681263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6460155 + ... + 6460162.

Almost surely, 2^51681268 is an apocalyptic number.

It is an amenable number.

51681268 is a deficient number, since it is larger than the sum of its proper divisors (38760958).

51681268 is a wasteful number, since it uses less digits than its factorization.

51681268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12920321 (or 12920319 counting only the distinct ones).

The product of its digits is 23040, while the sum is 37.

The square root of 51681268 is about 7188.9684934627. The cubic root of 51681268 is about 372.4869427731.

The spelling of 51681268 in words is "fifty-one million, six hundred eighty-one thousand, two hundred sixty-eight".