51187520 has 56 divisors (see below), whose sum is σ = 128320800. Its totient is φ = 19395072.

The previous prime is 51187483. The next prime is 51187529. The reversal of 51187520 is 2578115.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51187529) 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, 1871 + ... + 10289.

Almost surely, 2^51187520 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 51187520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64160400).

51187520 is an abundant number, since it is smaller than the sum of its proper divisors (77133280).

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

51187520 is a wasteful number, since it uses less digits than its factorization.

51187520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8455 (or 8445 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 29.

The square root of 51187520 is about 7154.5454083401. The cubic root of 51187520 is about 371.2969339099.

The spelling of 51187520 in words is "fifty-one million, one hundred eighty-seven thousand, five hundred twenty".