51199908 has 72 divisors (see below), whose sum is σ = 129040128. Its totient is φ = 15792192.

The previous prime is 51199891. The next prime is 51199921. The reversal of 51199908 is 80999115.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 51199908.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 229485 + ... + 229707.

It is an arithmetic number, because the mean of its divisors is an integer number (1792224).

Almost surely, 2^51199908 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 51199908, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64520064).

51199908 is an abundant number, since it is smaller than the sum of its proper divisors (77840220).

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

51199908 is a wasteful number, since it uses less digits than its factorization.

51199908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321 (or 300 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 42.

The square root of 51199908 is about 7155.4110993010. The cubic root of 51199908 is about 371.3268842794.

The spelling of 51199908 in words is "fifty-one million, one hundred ninety-nine thousand, nine hundred eight".