51280506 has 64 divisors (see below), whose sum is σ = 121113600. Its totient is φ = 16038000.

The previous prime is 51280469. The next prime is 51280511. The reversal of 51280506 is 60508215.

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

It is a self number, because there is not a number n which added to its sum of digits gives 51280506.

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, 154761 + ... + 155091.

It is an arithmetic number, because the mean of its divisors is an integer number (1892400).

Almost surely, 2^51280506 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51280506, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60556800).

51280506 is an abundant number, since it is smaller than the sum of its proper divisors (69833094).

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

51280506 is a wasteful number, since it uses less digits than its factorization.

51280506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512 (or 506 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 51280506 is about 7161.0408461340. The cubic root of 51280506 is about 371.5216275577.

It can be divided in two parts, 512 and 80506, that added together give a palindrome (81018).

The spelling of 51280506 in words is "fifty-one million, two hundred eighty thousand, five hundred six".