51081528 has 64 divisors (see below), whose sum is σ = 137894400. Its totient is φ = 15720320.

The previous prime is 51081517. The next prime is 51081529. The reversal of 51081528 is 82518015.

It is a junction number, because it is equal to n+sod(n) for n = 51081495 and 51081504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51081529) 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, 14413 + ... + 17603.

It is an arithmetic number, because the mean of its divisors is an integer number (2154600).

Almost surely, 2^51081528 is an apocalyptic number.

51081528 is a gapful number since it is divisible by the number (58) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51081528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68947200).

51081528 is an abundant number, since it is smaller than the sum of its proper divisors (86812872).

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

51081528 is a wasteful number, since it uses less digits than its factorization.

51081528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3252 (or 3248 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 30.

The square root of 51081528 is about 7147.1342508729. The cubic root of 51081528 is about 371.0404801286.

The spelling of 51081528 in words is "fifty-one million, eighty-one thousand, five hundred twenty-eight".