51999808 has 112 divisors (see below), whose sum is σ = 128016000. Its totient is φ = 20459520.

The previous prime is 51999799. The next prime is 51999833. The reversal of 51999808 is 80899915.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (112).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 348918 + ... + 349066.

It is an arithmetic number, because the mean of its divisors is an integer number (1143000).

Almost surely, 2^51999808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51999808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64008000).

51999808 is an abundant number, since it is smaller than the sum of its proper divisors (76016192).

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

51999808 is a wasteful number, since it uses less digits than its factorization.

51999808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228 (or 218 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 49.

The square root of 51999808 is about 7211.0892381110. The cubic root of 51999808 is about 373.2506562952.

The spelling of 51999808 in words is "fifty-one million, nine hundred ninety-nine thousand, eight hundred eight".