51550240 has 48 divisors (see below), whose sum is σ = 139188672. Its totient is φ = 17673984.

The previous prime is 51550237. The next prime is 51550259. The reversal of 51550240 is 4205515.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21894 + ... + 24133.

It is an arithmetic number, because the mean of its divisors is an integer number (2899764).

Almost surely, 2^51550240 is an apocalyptic number.

It is an amenable number.

51550240 is an abundant number, since it is smaller than the sum of its proper divisors (87638432).

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

51550240 is a wasteful number, since it uses less digits than its factorization.

51550240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46049 (or 46041 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 51550240 is about 7179.8495805971. The cubic root of 51550240 is about 372.1718864964.

Adding to 51550240 its reverse (4205515), we get a palindrome (55755755).

The spelling of 51550240 in words is "fifty-one million, five hundred fifty thousand, two hundred forty".