51240244 has 48 divisors (see below), whose sum is σ = 105368256. Its totient is φ = 21542400.

The previous prime is 51240221. The next prime is 51240253. The reversal of 51240244 is 44204215.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

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, 45067 + ... + 46189.

It is an arithmetic number, because the mean of its divisors is an integer number (2195172).

Almost surely, 2^51240244 is an apocalyptic number.

It is an amenable number.

51240244 is an abundant number, since it is smaller than the sum of its proper divisors (54128012).

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

51240244 is a wasteful number, since it uses less digits than its factorization.

51240244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1216 (or 1214 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 51240244 is about 7158.2291106111. The cubic root of 51240244 is about 371.4243708457.

Adding to 51240244 its reverse (44204215), we get a palindrome (95444459).

The spelling of 51240244 in words is "fifty-one million, two hundred forty thousand, two hundred forty-four".