51687432 has 48 divisors (see below), whose sum is σ = 141972480. Its totient is φ = 16984800.

The previous prime is 51687413. The next prime is 51687439. The reversal of 51687432 is 23478615.

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

It is not an unprimeable number, because it can be changed into a prime (51687439) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 57 + ... + 10167.

It is an arithmetic number, because the mean of its divisors is an integer number (2957760).

Almost surely, 2^51687432 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 51687432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70986240).

51687432 is an abundant number, since it is smaller than the sum of its proper divisors (90285048).

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

51687432 is a wasteful number, since it uses less digits than its factorization.

51687432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10194 (or 10187 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 51687432 is about 7189.3971930893. The cubic root of 51687432 is about 372.5017509639.

The spelling of 51687432 in words is "fifty-one million, six hundred eighty-seven thousand, four hundred thirty-two".