51745520 has 40 divisors (see below), whose sum is σ = 121773456. Its totient is φ = 20446208.

The previous prime is 51745517. The next prime is 51745549. The reversal of 51745520 is 2554715.

It is a tau number, because it is divible by the number of its divisors (40).

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, 2744 + ... + 10536.

Almost surely, 2^51745520 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 51745520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60886728).

51745520 is an abundant number, since it is smaller than the sum of its proper divisors (70027936).

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

51745520 is a wasteful number, since it uses less digits than its factorization.

51745520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7889 (or 7883 counting only the distinct ones).

The product of its (nonzero) digits is 7000, while the sum is 29.

The square root of 51745520 is about 7193.4358967047. The cubic root of 51745520 is about 372.6412418753.

The spelling of 51745520 in words is "fifty-one million, seven hundred forty-five thousand, five hundred twenty".