51533540 has 24 divisors (see below), whose sum is σ = 108706752. Its totient is φ = 20520800.

The previous prime is 51533539. The next prime is 51533549. The reversal of 51533540 is 4533515.

It is not an unprimeable number, because it can be changed into a prime (51533549) 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, 1136 + ... + 10215.

It is an arithmetic number, because the mean of its divisors is an integer number (4529448).

Almost surely, 2^51533540 is an apocalyptic number.

It is an amenable number.

51533540 is an abundant number, since it is smaller than the sum of its proper divisors (57173212).

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

51533540 is a wasteful number, since it uses less digits than its factorization.

51533540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11587 (or 11585 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 26.

The square root of 51533540 is about 7178.6865093832. The cubic root of 51533540 is about 372.1316930735.

The spelling of 51533540 in words is "fifty-one million, five hundred thirty-three thousand, five hundred forty".