51430032 has 160 divisors (see below), whose sum is σ = 160704000. Its totient is φ = 15685632.

The previous prime is 51430019. The next prime is 51430039. The reversal of 51430032 is 23003415.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 51429987 and 51430014.

It is not an unprimeable number, because it can be changed into a prime (51430039) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 345094 + ... + 345242.

It is an arithmetic number, because the mean of its divisors is an integer number (1004400).

Almost surely, 2^51430032 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 51430032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80352000).

51430032 is an abundant number, since it is smaller than the sum of its proper divisors (109273968).

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

51430032 is a wasteful number, since it uses less digits than its factorization.

51430032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230 (or 218 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 51430032 is about 7171.4734887609. The cubic root of 51430032 is about 371.8823769645.

Adding to 51430032 its reverse (23003415), we get a palindrome (74433447).

The spelling of 51430032 in words is "fifty-one million, four hundred thirty thousand, thirty-two".