51488540 has 24 divisors (see below), whose sum is σ = 108694320. Its totient is φ = 20487168.

The previous prime is 51488539. The next prime is 51488581. The reversal of 51488540 is 4588415.

It is a self number, because there is not a number n which added to its sum of digits gives 51488540.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2810 + ... + 10529.

It is an arithmetic number, because the mean of its divisors is an integer number (4528930).

Almost surely, 2^51488540 is an apocalyptic number.

It is an amenable number.

51488540 is an abundant number, since it is smaller than the sum of its proper divisors (57205780).

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

51488540 is a wasteful number, since it uses less digits than its factorization.

51488540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13541 (or 13539 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 35.

The square root of 51488540 is about 7175.5515467454. The cubic root of 51488540 is about 372.0233442012.

The spelling of 51488540 in words is "fifty-one million, four hundred eighty-eight thousand, five hundred forty".