51450000 has 240 divisors, whose sum is σ = 193737600. Its totient is φ = 11760000.

The previous prime is 51449977. The next prime is 51450013. The reversal of 51450000 is 5415.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7349997 + ... + 7350003.

It is an arithmetic number, because the mean of its divisors is an integer number (807240).

Almost surely, 2^51450000 is an apocalyptic number.

51450000 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 51450000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96868800).

51450000 is an abundant number, since it is smaller than the sum of its proper divisors (142287600).

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

51450000 is an frugal number, since it uses more digits than its factorization.

51450000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57 (or 17 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 15.

The square root of 51450000 is about 7172.8655361717. The cubic root of 51450000 is about 371.9304992139.

Adding to 51450000 its reverse (5415), we get a palindrome (51455415).

The spelling of 51450000 in words is "fifty-one million, four hundred fifty thousand".