51487800 has 384 divisors, whose sum is σ = 209986560. Its totient is φ = 10137600.

The previous prime is 51487771. The next prime is 51487817. The reversal of 51487800 is 878415.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1255780 + ... + 1255820.

It is an arithmetic number, because the mean of its divisors is an integer number (546840).

Almost surely, 2^51487800 is an apocalyptic number.

51487800 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is a pronic number, being equal to 7175×7176.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51487800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104993280).

51487800 is an abundant number, since it is smaller than the sum of its proper divisors (158498760).

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

51487800 is a wasteful number, since it uses less digits than its factorization.

51487800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103 (or 94 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 33.

The square root of 51487800 is about 7175.4999825796. The cubic root of 51487800 is about 372.0215619367.

The spelling of 51487800 in words is "fifty-one million, four hundred eighty-seven thousand, eight hundred".