51125280 has 96 divisors (see below), whose sum is σ = 164856384. Its totient is φ = 13310976.

The previous prime is 51125279. The next prime is 51125299. The reversal of 51125280 is 8252115.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×51125280² = 5227588510156800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 51125280.

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, 19402 + ... + 21878.

It is an arithmetic number, because the mean of its divisors is an integer number (1717254).

Almost surely, 2^51125280 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 51125280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82428192).

51125280 is an abundant number, since it is smaller than the sum of its proper divisors (113731104).

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

51125280 is a wasteful number, since it uses less digits than its factorization.

51125280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2538 (or 2530 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 24.

The square root of 51125280 is about 7150.1944029516. The cubic root of 51125280 is about 371.1463835808.

Adding to 51125280 its reverse (8252115), we get a palindrome (59377395).

The spelling of 51125280 in words is "fifty-one million, one hundred twenty-five thousand, two hundred eighty".