51650000 has 60 divisors (see below), whose sum is σ = 125202924. Its totient is φ = 20640000.

The previous prime is 51649951. The next prime is 51650033. The reversal of 51650000 is 5615.

It can be written as a sum of positive squares in 6 ways, for example, as 28686736 + 22963264 = 5356^2 + 4792^2 .

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 49484 + ... + 50516.

Almost surely, 2^51650000 is an apocalyptic number.

51650000 is a gapful number since it is divisible by the number (50) 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 51650000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62601462).

51650000 is an abundant number, since it is smaller than the sum of its proper divisors (73552924).

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

51650000 is an equidigital number, since it uses as much as digits as its factorization.

51650000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1066 (or 1040 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 17.

The square root of 51650000 is about 7186.7934435324. The cubic root of 51650000 is about 372.4118074173.

Adding to 51650000 its reverse (5615), we get a palindrome (51655615).

The spelling of 51650000 in words is "fifty-one million, six hundred fifty thousand".