51163650 has 72 divisors (see below), whose sum is σ = 142584624. Its totient is φ = 13640400.

The previous prime is 51163649. The next prime is 51163687. The reversal of 51163650 is 5636115.

It is a happy number.

51163650 is a `hidden beast` number, since 5 + 1 + 1 + 6 + 3 + 650 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 10045 + ... + 14255.

It is an arithmetic number, because the mean of its divisors is an integer number (1980342).

Almost surely, 2^51163650 is an apocalyptic number.

51163650 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 51163650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71292312).

51163650 is an abundant number, since it is smaller than the sum of its proper divisors (91420974).

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

51163650 is a wasteful number, since it uses less digits than its factorization.

51163650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4238 (or 4221 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 51163650 is about 7152.8770435399. The cubic root of 51163650 is about 371.2392099711.

Adding to 51163650 its reverse (5636115), we get a palindrome (56799765).

The spelling of 51163650 in words is "fifty-one million, one hundred sixty-three thousand, six hundred fifty".