51433320 has 64 divisors (see below), whose sum is σ = 157230720. Its totient is φ = 13455104.

The previous prime is 51433307. The next prime is 51433321. The reversal of 51433320 is 2333415.

It is not an unprimeable number, because it can be changed into a prime (51433321) 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, 2317 + ... + 10403.

It is an arithmetic number, because the mean of its divisors is an integer number (2456730).

Almost surely, 2^51433320 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 51433320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78615360).

51433320 is an abundant number, since it is smaller than the sum of its proper divisors (105797400).

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

51433320 is a wasteful number, since it uses less digits than its factorization.

51433320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8154 (or 8150 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 21.

The square root of 51433320 is about 7171.7027266891. The cubic root of 51433320 is about 371.8903017972.

Adding to 51433320 its reverse (2333415), we get a palindrome (53766735).

The spelling of 51433320 in words is "fifty-one million, four hundred thirty-three thousand, three hundred twenty".