51619540 has 36 divisors (see below), whose sum is σ = 126101556. Its totient is φ = 17697792.

The previous prime is 51619517. The next prime is 51619597. The reversal of 51619540 is 4591615.

51619540 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 2 ways, for example, as 19945156 + 31674384 = 4466^2 + 5628^2 .

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 25357 + ... + 27316.

It is an arithmetic number, because the mean of its divisors is an integer number (3502821).

Almost surely, 2^51619540 is an apocalyptic number.

It is an amenable number.

51619540 is an abundant number, since it is smaller than the sum of its proper divisors (74482016).

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

51619540 is a wasteful number, since it uses less digits than its factorization.

51619540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52696 (or 52687 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 51619540 is about 7184.6739661588. The cubic root of 51619540 is about 372.3385844788.

The spelling of 51619540 in words is "fifty-one million, six hundred nineteen thousand, five hundred forty".