51802780 has 12 divisors (see below), whose sum is σ = 108785880. Its totient is φ = 20721104.

The previous prime is 51802769. The next prime is 51802781. The reversal of 51802780 is 8720815.

51802780 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51802781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1295050 + ... + 1295089.

It is an arithmetic number, because the mean of its divisors is an integer number (9065490).

Almost surely, 2^51802780 is an apocalyptic number.

It is an amenable number.

51802780 is an abundant number, since it is smaller than the sum of its proper divisors (56983100).

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

51802780 is a wasteful number, since it uses less digits than its factorization.

51802780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2590148 (or 2590146 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 31.

The square root of 51802780 is about 7197.4148136675. The cubic root of 51802780 is about 372.7786423169.

The spelling of 51802780 in words is "fifty-one million, eight hundred two thousand, seven hundred eighty".