51128280 has 128 divisors (see below), whose sum is σ = 194803200. Its totient is φ = 11684736.

The previous prime is 51128267. The next prime is 51128281. The reversal of 51128280 is 8282115.

It is a super-2 number, since 2×51128280² = 5228202031516800, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51128281) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4179 + ... + 10941.

It is an arithmetic number, because the mean of its divisors is an integer number (1521900).

Almost surely, 2^51128280 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 51128280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97401600).

51128280 is an abundant number, since it is smaller than the sum of its proper divisors (143674920).

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

51128280 is a wasteful number, since it uses less digits than its factorization.

51128280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6790 (or 6780 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The square root of 51128280 is about 7150.4041843801. The cubic root of 51128280 is about 371.1536429860.

The spelling of 51128280 in words is "fifty-one million, one hundred twenty-eight thousand, two hundred eighty".