51229984 has 36 divisors (see below), whose sum is σ = 109225746. Its totient is φ = 23642112.

The previous prime is 51229967. The next prime is 51229987. The reversal of 51229984 is 48992215.

It can be written as a sum of positive squares in 3 ways, for example, as 40602384 + 10627600 = 6372^2 + 3260^2 .

It is a super-2 number, since 2×51229984² = 5249022521280512, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51229987) 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 5 ways as a sum of consecutive naturals, for example, 672 + ... + 10144.

Almost surely, 2^51229984 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 51229984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54612873).

51229984 is an abundant number, since it is smaller than the sum of its proper divisors (57995762).

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

51229984 is a wasteful number, since it uses less digits than its factorization.

51229984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9509 (or 9488 counting only the distinct ones).

The product of its digits is 51840, while the sum is 40.

The square root of 51229984 is about 7157.5124170343. The cubic root of 51229984 is about 371.3995786893.

The spelling of 51229984 in words is "fifty-one million, two hundred twenty-nine thousand, nine hundred eighty-four".