51558220 has 24 divisors (see below), whose sum is σ = 123740064. Its totient is φ = 17677056.

The previous prime is 51558217. The next prime is 51558223. The reversal of 51558220 is 2285515.

51558220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (51558217) and next prime (51558223).

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (51558223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 183997 + ... + 184276.

It is an arithmetic number, because the mean of its divisors is an integer number (5155836).

Almost surely, 2^51558220 is an apocalyptic number.

It is an amenable number.

51558220 is an abundant number, since it is smaller than the sum of its proper divisors (72181844).

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

51558220 is a wasteful number, since it uses less digits than its factorization.

51558220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368289 (or 368287 counting only the distinct ones).

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

The square root of 51558220 is about 7180.4052810409. The cubic root of 51558220 is about 372.1910896298.

The spelling of 51558220 in words is "fifty-one million, five hundred fifty-eight thousand, two hundred twenty".