51543540 has 60 divisors (see below), whose sum is σ = 161699076. Its totient is φ = 13744512.

The previous prime is 51543539. The next prime is 51543559. The reversal of 51543540 is 4534515.

It can be written as a sum of positive squares in 2 ways, for example, as 33802596 + 17740944 = 5814^2 + 4212^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 14289 + ... + 17528.

Almost surely, 2^51543540 is an apocalyptic number.

It is an amenable number.

51543540 is an abundant number, since it is smaller than the sum of its proper divisors (110155536).

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

51543540 is a wasteful number, since it uses less digits than its factorization.

51543540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31838 (or 31827 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 51543540 is about 7179.3829818446. The cubic root of 51543540 is about 372.1557620342.

The spelling of 51543540 in words is "fifty-one million, five hundred forty-three thousand, five hundred forty".