51489432 has 80 divisors (see below), whose sum is σ = 145345200. Its totient is φ = 17029440.

The previous prime is 51489421. The next prime is 51489457. The reversal of 51489432 is 23498415.

It is a Harshad number since it is a multiple of its sum of digits (36).

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 19 ways as a sum of consecutive naturals, for example, 117069 + ... + 117507.

It is an arithmetic number, because the mean of its divisors is an integer number (1816815).

Almost surely, 2^51489432 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 51489432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72672600).

51489432 is an abundant number, since it is smaller than the sum of its proper divisors (93855768).

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

51489432 is a wasteful number, since it uses less digits than its factorization.

51489432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 638 (or 625 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 51489432 is about 7175.6137019770. The cubic root of 51489432 is about 372.0254925298.

The spelling of 51489432 in words is "fifty-one million, four hundred eighty-nine thousand, four hundred thirty-two".