51516520 has 64 divisors (see below), whose sum is σ = 127319040. Its totient is φ = 18604800.

The previous prime is 51516503. The next prime is 51516539. The reversal of 51516520 is 2561515.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83734 + ... + 84346.

It is an arithmetic number, because the mean of its divisors is an integer number (1989360).

Almost surely, 2^51516520 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 51516520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63659520).

51516520 is an abundant number, since it is smaller than the sum of its proper divisors (75802520).

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

51516520 is a wasteful number, since it uses less digits than its factorization.

51516520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 826 (or 822 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 51516520 is about 7177.5009578543. The cubic root of 51516520 is about 372.0907205417.

The spelling of 51516520 in words is "fifty-one million, five hundred sixteen thousand, five hundred twenty".