51199680 has 224 divisors, whose sum is σ = 196047360. Its totient is φ = 11059200.

The previous prime is 51199667. The next prime is 51199691. The reversal of 51199680 is 8699115.

It is a tau number, because it is divible by the number of its divisors (224).

It is a Saint-Exupery number, since it is equal to the product of the sides of a Pythagorean triangle: 802 × 798 × 80.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 127480 + ... + 127880.

Almost surely, 2^51199680 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 51199680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98023680).

51199680 is an abundant number, since it is smaller than the sum of its proper divisors (144847680).

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

51199680 is a wasteful number, since it uses less digits than its factorization.

51199680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447 (or 437 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 39.

The square root of 51199680 is about 7155.3951672846. The cubic root of 51199680 is about 371.3263330893.

The spelling of 51199680 in words is "fifty-one million, one hundred ninety-nine thousand, six hundred eighty".