51445440 has 84 divisors (see below), whose sum is σ = 176960784. Its totient is φ = 13718016.

The previous prime is 51445439. The next prime is 51445477. The reversal of 51445440 is 4454415.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6052 + ... + 11811.

It is an arithmetic number, because the mean of its divisors is an integer number (2106676).

Almost surely, 2^51445440 is an apocalyptic number.

It is an amenable number.

51445440 is an abundant number, since it is smaller than the sum of its proper divisors (125515344).

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

51445440 is a wasteful number, since it uses less digits than its factorization.

51445440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17886 (or 17873 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 27.

The square root of 51445440 is about 7172.5476645332. The cubic root of 51445440 is about 371.9195108551.

Adding to 51445440 its reverse (4454415), we get a palindrome (55899855).

Subtracting from 51445440 its reverse (4454415), we obtain a square (46991025 = 6855²).

It can be divided in two parts, 514 and 45440, that added together give a palindrome (45954).

The spelling of 51445440 in words is "fifty-one million, four hundred forty-five thousand, four hundred forty".