51775780 has 24 divisors (see below), whose sum is σ = 124262208. Its totient is φ = 17751648.

The previous prime is 51775777. The next prime is 51775781. The reversal of 51775780 is 8757715.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (51775781) 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, 184774 + ... + 185053.

It is an arithmetic number, because the mean of its divisors is an integer number (5177592).

Almost surely, 2^51775780 is an apocalyptic number.

It is an amenable number.

51775780 is an abundant number, since it is smaller than the sum of its proper divisors (72486428).

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

51775780 is a wasteful number, since it uses less digits than its factorization.

51775780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369843 (or 369841 counting only the distinct ones).

The product of its (nonzero) digits is 68600, while the sum is 40.

The square root of 51775780 is about 7195.5388957325. The cubic root of 51775780 is about 372.7138660474.

The spelling of 51775780 in words is "fifty-one million, seven hundred seventy-five thousand, seven hundred eighty".