51683540 has 24 divisors (see below), whose sum is σ = 109658472. Its totient is φ = 20459520.

The previous prime is 51683537. The next prime is 51683543. The reversal of 51683540 is 4538615.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (51683537) and next prime (51683543).

It can be written as a sum of positive squares in 4 ways, for example, as 44944 + 51638596 = 212^2 + 7186^2 .

It is a junction number, because it is equal to n+sod(n) for n = 51683497 and 51683506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51683543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11381 + ... + 15260.

It is an arithmetic number, because the mean of its divisors is an integer number (4569103).

Almost surely, 2^51683540 is an apocalyptic number.

It is an amenable number.

51683540 is an abundant number, since it is smaller than the sum of its proper divisors (57974932).

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

51683540 is a wasteful number, since it uses less digits than its factorization.

51683540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26747 (or 26745 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 51683540 is about 7189.1265116146. The cubic root of 51683540 is about 372.4924010882.

The spelling of 51683540 in words is "fifty-one million, six hundred eighty-three thousand, five hundred forty".