51971668 has 24 divisors (see below), whose sum is σ = 104115200. Its totient is φ = 22236768.

The previous prime is 51971663. The next prime is 51971677. The reversal of 51971668 is 86617915.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51971663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22093 + ... + 24331.

Almost surely, 2^51971668 is an apocalyptic number.

It is an amenable number.

51971668 is an abundant number, since it is smaller than the sum of its proper divisors (52143532).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51971668 is a wasteful number, since it uses less digits than its factorization.

51971668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3079 (or 3077 counting only the distinct ones).

The product of its digits is 90720, while the sum is 43.

The square root of 51971668 is about 7209.1378125265. The cubic root of 51971668 is about 373.1833152217.

The spelling of 51971668 in words is "fifty-one million, nine hundred seventy-one thousand, six hundred sixty-eight".