51818500 has 48 divisors (see below), whose sum is σ = 116271792. Its totient is φ = 20160000.

The previous prime is 51818489. The next prime is 51818513. The reversal of 51818500 is 581815.

It can be written as a sum of positive squares in 8 ways, for example, as 6874884 + 44943616 = 2622^2 + 6704^2 .

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17100 + ... + 19900.

It is an arithmetic number, because the mean of its divisors is an integer number (2422329).

Almost surely, 2^51818500 is an apocalyptic number.

51818500 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 51818500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58135896).

51818500 is an abundant number, since it is smaller than the sum of its proper divisors (64453292).

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

51818500 is a wasteful number, since it uses less digits than its factorization.

51818500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2857 (or 2845 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 28.

The square root of 51818500 is about 7198.5067896057. The cubic root of 51818500 is about 372.8163461338.

The spelling of 51818500 in words is "fifty-one million, eight hundred eighteen thousand, five hundred".