51432738 has 64 divisors (see below), whose sum is σ = 126074880. Its totient is φ = 13666752.

The previous prime is 51432707. The next prime is 51432739. The reversal of 51432738 is 83723415.

It is a junction number, because it is equal to n+sod(n) for n = 51432699 and 51432708.

It is not an unprimeable number, because it can be changed into a prime (51432739) 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, 35023 + ... + 36461.

It is an arithmetic number, because the mean of its divisors is an integer number (1969920).

Almost surely, 2^51432738 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51432738, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63037440).

51432738 is an abundant number, since it is smaller than the sum of its proper divisors (74642142).

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

51432738 is a wasteful number, since it uses less digits than its factorization.

51432738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1511.

The product of its digits is 20160, while the sum is 33.

The square root of 51432738 is about 7171.6621504363. The cubic root of 51432738 is about 371.8888990686. Note that the first 4 decimals are identical.

The spelling of 51432738 in words is "fifty-one million, four hundred thirty-two thousand, seven hundred thirty-eight".