51780560 has 40 divisors (see below), whose sum is σ = 129653160. Its totient is φ = 19118592.

The previous prime is 51780541. The next prime is 51780569. The reversal of 51780560 is 6508715.

It can be written as a sum of positive squares in 4 ways, for example, as 55696 + 51724864 = 236^2 + 7192^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51780569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23855 + ... + 25934.

It is an arithmetic number, because the mean of its divisors is an integer number (3241329).

Almost surely, 2^51780560 is an apocalyptic number.

It is an amenable number.

51780560 is an abundant number, since it is smaller than the sum of its proper divisors (77872600).

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

51780560 is a wasteful number, since it uses less digits than its factorization.

51780560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49815 (or 49809 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 32.

The square root of 51780560 is about 7195.8710383108. The cubic root of 51780560 is about 372.7253354865.

The spelling of 51780560 in words is "fifty-one million, seven hundred eighty thousand, five hundred sixty".