51520536 has 80 divisors (see below), whose sum is σ = 147741000. Its totient is φ = 16774128.

The previous prime is 51520499. The next prime is 51520583. The reversal of 51520536 is 63502515.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is an ABA number since it can be written as A⋅B^A, here for A=3, B=258.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1198131 + ... + 1198173.

Almost surely, 2^51520536 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 51520536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73870500).

51520536 is an abundant number, since it is smaller than the sum of its proper divisors (96220464).

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

51520536 is an frugal number, since it uses more digits than its factorization.

51520536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147 (or 48 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 27.

The square root of 51520536 is about 7177.7807155137. The cubic root of 51520536 is about 372.1003891393.

The spelling of 51520536 in words is "fifty-one million, five hundred twenty thousand, five hundred thirty-six".