51274840 has 16 divisors (see below), whose sum is σ = 115368480. Its totient is φ = 20509920.

The previous prime is 51274829. The next prime is 51274849. The reversal of 51274840 is 4847215.

It is a super-3 number, since 3×51274840³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51274849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 640896 + ... + 640975.

It is an arithmetic number, because the mean of its divisors is an integer number (7210530).

Almost surely, 2^51274840 is an apocalyptic number.

It is an amenable number.

51274840 is an abundant number, since it is smaller than the sum of its proper divisors (64093640).

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

51274840 is a wasteful number, since it uses less digits than its factorization.

51274840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1281882 (or 1281878 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 51274840 is about 7160.6452223246. The cubic root of 51274840 is about 371.5079438713.

The spelling of 51274840 in words is "fifty-one million, two hundred seventy-four thousand, eight hundred forty".