51127840 has 48 divisors (see below), whose sum is σ = 127901592. Its totient is φ = 19247104.

The previous prime is 51127801. The next prime is 51127877. The reversal of 51127840 is 4872115.

It can be written as a sum of positive squares in 4 ways, for example, as 50183056 + 944784 = 7084^2 + 972^2 .

It is a super-2 number, since 2×51127840² = 5228112046131200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51127799 and 51127808.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6679 + ... + 12118.

Almost surely, 2^51127840 is an apocalyptic number.

It is an amenable number.

51127840 is an abundant number, since it is smaller than the sum of its proper divisors (76773752).

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

51127840 is a wasteful number, since it uses less digits than its factorization.

51127840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18829 (or 18821 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 51127840 is about 7150.3734168224. The cubic root of 51127840 is about 371.1525782910.

Adding to 51127840 its reverse (4872115), we get a palindrome (55999955).

The spelling of 51127840 in words is "fifty-one million, one hundred twenty-seven thousand, eight hundred forty".