51802500 has 60 divisors (see below), whose sum is σ = 151064144. Its totient is φ = 13812000.

The previous prime is 51802489. The next prime is 51802501. The reversal of 51802500 is 520815.

It is a tau number, because it is divible by the number of its divisors (60).

It is not an unprimeable number, because it can be changed into a prime (51802501) by changing a digit.

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 19 ways as a sum of consecutive naturals, for example, 4047 + ... + 10953.

Almost surely, 2^51802500 is an apocalyptic number.

51802500 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 51802500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75532072).

51802500 is an abundant number, since it is smaller than the sum of its proper divisors (99261644).

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

51802500 is a wasteful number, since it uses less digits than its factorization.

51802500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6934 (or 6917 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 51802500 is about 7197.3953622126. The cubic root of 51802500 is about 372.7779706785. Note that the first 3 decimals are identical.

The spelling of 51802500 in words is "fifty-one million, eight hundred two thousand, five hundred".