51780285 has 12 divisors (see below), whose sum is σ = 89752572. Its totient is φ = 27616128.

The previous prime is 51780271. The next prime is 51780343. The reversal of 51780285 is 58208715.

It can be written as a sum of positive squares in 2 ways, for example, as 8259876 + 43520409 = 2874^2 + 6597^2 .

It is not a de Polignac number, because 51780285 - 2⁶ = 51780221 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 575292 + ... + 575381.

It is an arithmetic number, because the mean of its divisors is an integer number (7479381).

Almost surely, 2^51780285 is an apocalyptic number.

It is an amenable number.

51780285 is a deficient number, since it is larger than the sum of its proper divisors (37972287).

51780285 is a wasteful number, since it uses less digits than its factorization.

51780285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1150684 (or 1150681 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 36.

The square root of 51780285 is about 7195.8519301053. The cubic root of 51780285 is about 372.7246756530.

The spelling of 51780285 in words is "fifty-one million, seven hundred eighty thousand, two hundred eighty-five".