51115380 has 48 divisors (see below), whose sum is σ = 143700480. Its totient is φ = 13575808.

The previous prime is 51115369. The next prime is 51115381. The reversal of 51115380 is 8351115.

It is a super-2 number, since 2×51115380² = 5225564145088800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51115380.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51115381) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14557 + ... + 17723.

It is an arithmetic number, because the mean of its divisors is an integer number (2993760).

Almost surely, 2^51115380 is an apocalyptic number.

It is an amenable number.

51115380 is an abundant number, since it is smaller than the sum of its proper divisors (92585100).

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

51115380 is a wasteful number, since it uses less digits than its factorization.

51115380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3448 (or 3446 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 24.

The square root of 51115380 is about 7149.5020805648. The cubic root of 51115380 is about 371.1224255285.

Adding to 51115380 its reverse (8351115), we get a palindrome (59466495).

The spelling of 51115380 in words is "fifty-one million, one hundred fifteen thousand, three hundred eighty".