51861648 has 20 divisors (see below), whose sum is σ = 133976048. Its totient is φ = 17287200.

The previous prime is 51861643. The next prime is 51861661. The reversal of 51861648 is 84616815.

It is a zygodrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (51861643) 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 3 ways as a sum of consecutive naturals, for example, 540178 + ... + 540273.

Almost surely, 2^51861648 is an apocalyptic number.

It is an amenable number.

51861648 is an abundant number, since it is smaller than the sum of its proper divisors (82114400).

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

51861648 is a wasteful number, since it uses less digits than its factorization.

51861648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1080462 (or 1080456 counting only the distinct ones).

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

The square root of 51861648 is about 7201.5031764209. The cubic root of 51861648 is about 372.9197957826.

The spelling of 51861648 in words is "fifty-one million, eight hundred sixty-one thousand, six hundred forty-eight".