51108732 has 84 divisors (see below), whose sum is σ = 142124976. Its totient is φ = 16018560.

The previous prime is 51108731. The next prime is 51108751. The reversal of 51108732 is 23780115.

It is a super-2 number, since 2×51108732² = 5224204973295648, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 51108696 and 51108705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51108731) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 49057 + ... + 50087.

It is an arithmetic number, because the mean of its divisors is an integer number (1691964).

Almost surely, 2^51108732 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 51108732, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71062488).

51108732 is an abundant number, since it is smaller than the sum of its proper divisors (91016244).

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

51108732 is a wasteful number, since it uses less digits than its factorization.

51108732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1070 (or 1053 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 51108732 is about 7149.0371379648. The cubic root of 51108732 is about 371.1063355972.

Adding to 51108732 its reverse (23780115), we get a palindrome (74888847).

The spelling of 51108732 in words is "fifty-one million, one hundred eight thousand, seven hundred thirty-two".