51499800 has 360 divisors, whose sum is σ = 207280260. Its totient is φ = 11750400.

The previous prime is 51499769. The next prime is 51499801. The reversal of 51499800 is 899415.

It is a tau number, because it is divible by the number of its divisors (360).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51499801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 89 ways as a sum of consecutive naturals, for example, 3029392 + ... + 3029408.

Almost surely, 2^51499800 is an apocalyptic number.

51499800 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 51499800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103640130).

51499800 is an abundant number, since it is smaller than the sum of its proper divisors (155780460).

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

51499800 is a wasteful number, since it uses less digits than its factorization.

51499800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73 (or 38 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 51499800 is about 7176.3361125298. The cubic root of 51499800 is about 372.0504614169.

The spelling of 51499800 in words is "fifty-one million, four hundred ninety-nine thousand, eight hundred".