51528420 has 96 divisors (see below), whose sum is σ = 164707200. Its totient is φ = 13364352.

The previous prime is 51528413. The next prime is 51528467. The reversal of 51528420 is 2482515.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18691 + ... + 21269.

It is an arithmetic number, because the mean of its divisors is an integer number (1715700).

Almost surely, 2^51528420 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 51528420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82353600).

51528420 is an abundant number, since it is smaller than the sum of its proper divisors (113178780).

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

51528420 is a wasteful number, since it uses less digits than its factorization.

51528420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2634 (or 2626 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 51528420 is about 7178.3298893266. The cubic root of 51528420 is about 372.1193685604.

The spelling of 51528420 in words is "fifty-one million, five hundred twenty-eight thousand, four hundred twenty".