51621200 has 120 divisors (see below), whose sum is σ = 134324736. Its totient is φ = 19008000.

The previous prime is 51621161. The next prime is 51621209. The reversal of 51621200 is 212615.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51621209) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 285110 + ... + 285290.

Almost surely, 2^51621200 is an apocalyptic number.

51621200 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 51621200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67162368).

51621200 is an abundant number, since it is smaller than the sum of its proper divisors (82703536).

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

51621200 is a wasteful number, since it uses less digits than its factorization.

51621200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253 (or 242 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 51621200 is about 7184.7894889134. The cubic root of 51621200 is about 372.3425757027.

Adding to 51621200 its reverse (212615), we get a palindrome (51833815).

The spelling of 51621200 in words is "fifty-one million, six hundred twenty-one thousand, two hundred".