51535540 has 24 divisors (see below), whose sum is σ = 123685632. Its totient is φ = 17669280.

The previous prime is 51535537. The next prime is 51535559. The reversal of 51535540 is 4553515.

51535540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 51535499 and 51535508.

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 7 ways as a sum of consecutive naturals, for example, 183916 + ... + 184195.

It is an arithmetic number, because the mean of its divisors is an integer number (5153568).

Almost surely, 2^51535540 is an apocalyptic number.

It is an amenable number.

51535540 is an abundant number, since it is smaller than the sum of its proper divisors (72150092).

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

51535540 is a wasteful number, since it uses less digits than its factorization.

51535540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368127 (or 368125 counting only the distinct ones).

The product of its (nonzero) digits is 7500, while the sum is 28.

The square root of 51535540 is about 7178.8258092811. The cubic root of 51535540 is about 372.1365071147.

The spelling of 51535540 in words is "fifty-one million, five hundred thirty-five thousand, five hundred forty".