51780340 has 24 divisors (see below), whose sum is σ = 109009152. Its totient is φ = 20660640.

The previous prime is 51780271. The next prime is 51780343. The reversal of 51780340 is 4308715.

51780340 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×51780340² = 5362407221031200, which contains 22 as substring.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 51780299 and 51780308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51780343) 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 7 ways as a sum of consecutive naturals, for example, 5617 + ... + 11623.

It is an arithmetic number, because the mean of its divisors is an integer number (4542048).

Almost surely, 2^51780340 is an apocalyptic number.

It is an amenable number.

51780340 is an abundant number, since it is smaller than the sum of its proper divisors (57228812).

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

51780340 is a wasteful number, since it uses less digits than its factorization.

51780340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6447 (or 6445 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 51780340 is about 7195.8557517504. The cubic root of 51780340 is about 372.7248076198.

The spelling of 51780340 in words is "fifty-one million, seven hundred eighty thousand, three hundred forty".