51505228 has 24 divisors (see below), whose sum is σ = 93761360. Its totient is φ = 24736320.

The previous prime is 51505213. The next prime is 51505273. The reversal of 51505228 is 82250515.

It is a super-2 number, since 2×51505228² = 5305577022663968, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51505196 and 51505205.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 8038 + ... + 12946.

Almost surely, 2^51505228 is an apocalyptic number.

It is an amenable number.

51505228 is a deficient number, since it is larger than the sum of its proper divisors (42256132).

51505228 is a wasteful number, since it uses less digits than its factorization.

51505228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5017 (or 5015 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 28.

The square root of 51505228 is about 7176.7142899798. The cubic root of 51505228 is about 372.0635321405.

The spelling of 51505228 in words is "fifty-one million, five hundred five thousand, two hundred twenty-eight".