51881664 has 28 divisors (see below), whose sum is σ = 137270744. Its totient is φ = 17293824.

The previous prime is 51881663. The next prime is 51881677. The reversal of 51881664 is 46618815.

It is not an unprimeable number, because it can be changed into a prime (51881663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134917 + ... + 135300.

Almost surely, 2^51881664 is an apocalyptic number.

It is an amenable number.

51881664 is an abundant number, since it is smaller than the sum of its proper divisors (85389080).

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

51881664 is a wasteful number, since it uses less digits than its factorization.

51881664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270232 (or 270222 counting only the distinct ones).

The product of its digits is 46080, while the sum is 39.

The square root of 51881664 is about 7202.8927522212. The cubic root of 51881664 is about 372.9677657362.

The spelling of 51881664 in words is "fifty-one million, eight hundred eighty-one thousand, six hundred sixty-four".