51010240 has 28 divisors (see below), whose sum is σ = 121468896. Its totient is φ = 20403968.

The previous prime is 51010237. The next prime is 51010259. The reversal of 51010240 is 4201015.

It is a self number, because there is not a number n which added to its sum of digits gives 51010240.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79384 + ... + 80023.

Almost surely, 2^51010240 is an apocalyptic number.

It is an amenable number.

51010240 is an abundant number, since it is smaller than the sum of its proper divisors (70458656).

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

51010240 is a wasteful number, since it uses less digits than its factorization.

51010240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159424 (or 159414 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 51010240 is about 7142.1453359617. The cubic root of 51010240 is about 370.8677950832.

Adding to 51010240 its reverse (4201015), we get a palindrome (55211255).

The spelling of 51010240 in words is "fifty-one million, ten thousand, two hundred forty".