51036820 has 12 divisors (see below), whose sum is σ = 107177364. Its totient is φ = 20414720.

The previous prime is 51036803. The next prime is 51036833. The reversal of 51036820 is 2863015.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 15586704 + 35450116 = 3948^2 + 5954^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1275901 + ... + 1275940.

It is an arithmetic number, because the mean of its divisors is an integer number (8931447).

Almost surely, 2^51036820 is an apocalyptic number.

It is an amenable number.

51036820 is an abundant number, since it is smaller than the sum of its proper divisors (56140544).

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

51036820 is a wasteful number, since it uses less digits than its factorization.

51036820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2551850 (or 2551848 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 51036820 is about 7144.0058790569. The cubic root of 51036820 is about 370.9322001537.

Adding to 51036820 its reverse (2863015), we get a palindrome (53899835).

The spelling of 51036820 in words is "fifty-one million, thirty-six thousand, eight hundred twenty".