51005504 has 56 divisors (see below), whose sum is σ = 112580928. Its totient is φ = 22730240.

The previous prime is 51005503. The next prime is 51005533. The reversal of 51005504 is 40550015.

It is a super-2 number, since 2×51005504² = 5203122876588032, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51005503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36629 + ... + 37995.

Almost surely, 2^51005504 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 51005504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56290464).

51005504 is an abundant number, since it is smaller than the sum of its proper divisors (61575424).

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

51005504 is a wasteful number, since it uses less digits than its factorization.

51005504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1443 (or 1433 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 20.

The square root of 51005504 is about 7141.8137752255. The cubic root of 51005504 is about 370.8563170987.

Adding to 51005504 its reverse (40550015), we get a palindrome (91555519).

The spelling of 51005504 in words is "fifty-one million, five thousand, five hundred four".