51987072 has 64 divisors (see below), whose sum is σ = 141861600. Its totient is φ = 16856064.

The previous prime is 51986999. The next prime is 51987077. The reversal of 51987072 is 27078915.

It is a tau number, because it is divible by the number of its divisors (64).

It is a self number, because there is not a number n which added to its sum of digits gives 51987072.

It is not an unprimeable number, because it can be changed into a prime (51987077) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12379 + ... + 16037.

Almost surely, 2^51987072 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 51987072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70930800).

51987072 is an abundant number, since it is smaller than the sum of its proper divisors (89874528).

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

51987072 is a wasteful number, since it uses less digits than its factorization.

51987072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3713 (or 3701 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 39.

The square root of 51987072 is about 7210.2060996895. The cubic root of 51987072 is about 373.2201811281.

The spelling of 51987072 in words is "fifty-one million, nine hundred eighty-seven thousand, seventy-two".