51033440 has 48 divisors (see below), whose sum is σ = 124467840. Its totient is φ = 19752960.

The previous prime is 51033427. The next prime is 51033457. The reversal of 51033440 is 4433015.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 185 + ... + 10104.

It is an arithmetic number, because the mean of its divisors is an integer number (2593080).

Almost surely, 2^51033440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51033440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62233920).

51033440 is an abundant number, since it is smaller than the sum of its proper divisors (73434400).

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

51033440 is a wasteful number, since it uses less digits than its factorization.

51033440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10335 (or 10327 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 51033440 is about 7143.7693131847. The cubic root of 51033440 is about 370.9240114348.

Adding to 51033440 its reverse (4433015), we get a palindrome (55466455).

The spelling of 51033440 in words is "fifty-one million, thirty-three thousand, four hundred forty".