51817248 has 72 divisors (see below), whose sum is σ = 168412608. Its totient is φ = 14804352.

The previous prime is 51817247. The next prime is 51817253. The reversal of 51817248 is 84271815.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (51817247) 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 11 ways as a sum of consecutive naturals, for example, 10836 + ... + 14867.

It is an arithmetic number, because the mean of its divisors is an integer number (2339064).

Almost surely, 2^51817248 is an apocalyptic number.

It is an amenable number.

51817248 is an abundant number, since it is smaller than the sum of its proper divisors (116595360).

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

51817248 is a wasteful number, since it uses less digits than its factorization.

51817248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25726 (or 25715 counting only the distinct ones).

The product of its digits is 17920, while the sum is 36.

The square root of 51817248 is about 7198.4198266008. The cubic root of 51817248 is about 372.8133435393.

It can be divided in two parts, 518 and 17248, that added together give a triangular number (17766 = T₁₈₈).

The spelling of 51817248 in words is "fifty-one million, eight hundred seventeen thousand, two hundred forty-eight".