51513740 has 48 divisors (see below), whose sum is σ = 115540992. Its totient is φ = 19224576.

The previous prime is 51513719. The next prime is 51513743. The reversal of 51513740 is 4731515.

It is not an unprimeable number, because it can be changed into a prime (51513743) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42584 + ... + 43776.

It is an arithmetic number, because the mean of its divisors is an integer number (2407104).

Almost surely, 2^51513740 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 51513740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57770496).

51513740 is an abundant number, since it is smaller than the sum of its proper divisors (64027252).

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

51513740 is a wasteful number, since it uses less digits than its factorization.

51513740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1346 (or 1344 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 26.

The square root of 51513740 is about 7177.3072945221. The cubic root of 51513740 is about 372.0840273437.

The spelling of 51513740 in words is "fifty-one million, five hundred thirteen thousand, seven hundred forty".