51917200 has 30 divisors (see below), whose sum is σ = 124732034. Its totient is φ = 20766720.

The previous prime is 51917189. The next prime is 51917207. The reversal of 51917200 is 271915.

It can be written as a sum of positive squares in 3 ways, for example, as 9511056 + 42406144 = 3084^2 + 6512^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (51917207) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 64497 + ... + 65296.

Almost surely, 2^51917200 is an apocalyptic number.

51917200 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51917200 is an abundant number, since it is smaller than the sum of its proper divisors (72814834).

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

51917200 is a wasteful number, since it uses less digits than its factorization.

51917200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129811 (or 129800 counting only the distinct ones).

The product of its (nonzero) digits is 630, while the sum is 25.

The square root of 51917200 is about 7205.3591166575. The cubic root of 51917200 is about 373.0529002303.

The spelling of 51917200 in words is "fifty-one million, nine hundred seventeen thousand, two hundred".