51340432 has 80 divisors (see below), whose sum is σ = 123117120. Its totient is φ = 20390400.

The previous prime is 51340381. The next prime is 51340463. The reversal of 51340432 is 23404315.

It is a Harshad number since it is a multiple of its sum of digits (22).

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 15 ways as a sum of consecutive naturals, for example, 42882 + ... + 44062.

It is an arithmetic number, because the mean of its divisors is an integer number (1538964).

Almost surely, 2^51340432 is an apocalyptic number.

51340432 is a gapful number since it is divisible by the number (52) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51340432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61558560).

51340432 is an abundant number, since it is smaller than the sum of its proper divisors (71776688).

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

51340432 is a wasteful number, since it uses less digits than its factorization.

51340432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1232 (or 1226 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 51340432 is about 7165.2237927367. The cubic root of 51340432 is about 371.6662903154. Note that the first 3 decimals are identical.

Adding to 51340432 its reverse (23404315), we get a palindrome (74744747).

The spelling of 51340432 in words is "fifty-one million, three hundred forty thousand, four hundred thirty-two".