51966440 has 32 divisors (see below), whose sum is σ = 117969480. Its totient is φ = 20600832.

The previous prime is 51966427. The next prime is 51966457. The reversal of 51966440 is 4466915.

51966440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 28366276 + 23600164 = 5326^2 + 4858^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 51966440.

It is an unprimeable number.

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, 1229 + ... + 10268.

Almost surely, 2^51966440 is an apocalyptic number.

It is an amenable number.

51966440 is an abundant number, since it is smaller than the sum of its proper divisors (66003040).

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

51966440 is a wasteful number, since it uses less digits than its factorization.

51966440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11621 (or 11617 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 51966440 is about 7208.7752080364. The cubic root of 51966440 is about 373.1708015588.

It can be divided in two parts, 519 and 66440, that multiplied together give a triangular number (34482360 = T₈₃₀₄).

The spelling of 51966440 in words is "fifty-one million, nine hundred sixty-six thousand, four hundred forty".