51555040 has 96 divisors (see below), whose sum is σ = 129548160. Its totient is φ = 19353600.

The previous prime is 51554969. The next prime is 51555047. The reversal of 51555040 is 4055515.

It is a junction number, because it is equal to n+sod(n) for n = 51554996 and 51555014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51555047) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 190105 + ... + 190375.

It is an arithmetic number, because the mean of its divisors is an integer number (1349460).

Almost surely, 2^51555040 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 51555040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64774080).

51555040 is an abundant number, since it is smaller than the sum of its proper divisors (77993120).

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

51555040 is a wasteful number, since it uses less digits than its factorization.

51555040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356 (or 348 counting only the distinct ones).

The product of its (nonzero) digits is 2500, while the sum is 25.

The square root of 51555040 is about 7180.1838416575. The cubic root of 51555040 is about 372.1834374908.

It can be divided in two parts, 515 and 55040, that added together give a palindrome (55555).

The spelling of 51555040 in words is "fifty-one million, five hundred fifty-five thousand, forty".