51172416 has 84 divisors (see below), whose sum is σ = 148807932. Its totient is φ = 16809984.

The previous prime is 51172403. The next prime is 51172421. The reversal of 51172416 is 61427115.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 23040000 + 28132416 = 4800^2 + 5304^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 51172416.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41440 + ... + 42656.

It is an arithmetic number, because the mean of its divisors is an integer number (1771523).

Almost surely, 2^51172416 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 51172416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74403966).

51172416 is an abundant number, since it is smaller than the sum of its proper divisors (97635516).

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

51172416 is a wasteful number, since it uses less digits than its factorization.

51172416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1308 (or 1295 counting only the distinct ones).

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

The square root of 51172416 is about 7153.4897777239. The cubic root of 51172416 is about 371.2604105505.

It can be divided in two parts, 511 and 72416, that added together give a palindrome (72927).

The spelling of 51172416 in words is "fifty-one million, one hundred seventy-two thousand, four hundred sixteen".