51530432 has 56 divisors (see below), whose sum is σ = 111191040. Its totient is φ = 23604480.

The previous prime is 51530429. The next prime is 51530449. The reversal of 51530432 is 23403515.

It is a junction number, because it is equal to n+sod(n) for n = 51530398 and 51530407.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37013 + ... + 38379.

Almost surely, 2^51530432 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 51530432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55595520).

51530432 is an abundant number, since it is smaller than the sum of its proper divisors (59660608).

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

51530432 is a wasteful number, since it uses less digits than its factorization.

51530432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1429 (or 1419 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 51530432 is about 7178.4700319776. The cubic root of 51530432 is about 372.1242118063.

Adding to 51530432 its reverse (23403515), we get a palindrome (74933947).

The spelling of 51530432 in words is "fifty-one million, five hundred thirty thousand, four hundred thirty-two".