51033540 has 48 divisors (see below), whose sum is σ = 145942272. Its totient is φ = 13318656.

The previous prime is 51033523. The next prime is 51033547. The reversal of 51033540 is 4533015.

It is not an unprimeable number, because it can be changed into a prime (51033547) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6229 + ... + 11868.

It is an arithmetic number, because the mean of its divisors is an integer number (3040464).

Almost surely, 2^51033540 is an apocalyptic number.

It is an amenable number.

51033540 is an abundant number, since it is smaller than the sum of its proper divisors (94908732).

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

51033540 is a wasteful number, since it uses less digits than its factorization.

51033540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18156 (or 18154 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 21.

The square root of 51033540 is about 7143.7763122875. The cubic root of 51033540 is about 370.9242537098.

Adding to 51033540 its reverse (4533015), we get a palindrome (55566555).

The spelling of 51033540 in words is "fifty-one million, thirty-three thousand, five hundred forty".