51559620 has 48 divisors (see below), whose sum is σ = 164992128. Its totient is φ = 11784960.

The previous prime is 51559531. The next prime is 51559633. The reversal of 51559620 is 2695515.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60961 + ... + 61800.

It is an arithmetic number, because the mean of its divisors is an integer number (3437336).

Almost surely, 2^51559620 is an apocalyptic number.

It is an amenable number.

51559620 is an abundant number, since it is smaller than the sum of its proper divisors (113432508).

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

51559620 is a wasteful number, since it uses less digits than its factorization.

51559620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122780 (or 122778 counting only the distinct ones).

The product of its (nonzero) digits is 13500, while the sum is 33.

The square root of 51559620 is about 7180.5027679126. The cubic root of 51559620 is about 372.1944583963.

The spelling of 51559620 in words is "fifty-one million, five hundred fifty-nine thousand, six hundred twenty".