51432420 has 96 divisors (see below), whose sum is σ = 156304512. Its totient is φ = 12561408.

The previous prime is 51432391. The next prime is 51432431. The reversal of 51432420 is 2423415.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 181599 + ... + 181881.

It is an arithmetic number, because the mean of its divisors is an integer number (1628172).

Almost surely, 2^51432420 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 51432420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78152256).

51432420 is an abundant number, since it is smaller than the sum of its proper divisors (104872092).

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

51432420 is a wasteful number, since it uses less digits than its factorization.

51432420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 541 (or 539 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 51432420 is about 7171.6399798094. The cubic root of 51432420 is about 371.8881326248. Note that the first 3 decimals are identical.

Adding to 51432420 its reverse (2423415), we get a palindrome (53855835).

The spelling of 51432420 in words is "fifty-one million, four hundred thirty-two thousand, four hundred twenty".