51998208 has 80 divisors (see below), whose sum is σ = 140355600. Its totient is φ = 17104896.

The previous prime is 51998203. The next prime is 51998227. The reversal of 51998208 is 80289915.

It is a happy number.

It is a super-2 number, since 2×51998208² = 5407627270422528, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51998208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51998203) 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, 148818 + ... + 149166.

It is an arithmetic number, because the mean of its divisors is an integer number (1754445).

Almost surely, 2^51998208 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51998208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70177800).

51998208 is an abundant number, since it is smaller than the sum of its proper divisors (88357392).

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

51998208 is an equidigital number, since it uses as much as digits as its factorization.

51998208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467 (or 451 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 42.

The square root of 51998208 is about 7210.9782970135. The cubic root of 51998208 is about 373.2468280299.

The spelling of 51998208 in words is "fifty-one million, nine hundred ninety-eight thousand, two hundred eight".