51216300 has 90 divisors (see below), whose sum is σ = 166049268. Its totient is φ = 13655520.

The previous prime is 51216293. The next prime is 51216301. The reversal of 51216300 is 361215.

It is a tau number, because it is divible by the number of its divisors (90).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (51216301) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 4939 + ... + 11261.

Almost surely, 2^51216300 is an apocalyptic number.

51216300 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 51216300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83024634).

51216300 is an abundant number, since it is smaller than the sum of its proper divisors (114832968).

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

51216300 is a wasteful number, since it uses less digits than its factorization.

51216300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6349 (or 6333 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 51216300 is about 7156.5564344872. The cubic root of 51216300 is about 371.3665076633.

Adding to 51216300 its reverse (361215), we get a palindrome (51577515).

The spelling of 51216300 in words is "fifty-one million, two hundred sixteen thousand, three hundred".