51216830 has 32 divisors (see below), whose sum is σ = 106557120. Its totient is φ = 17360640.

The previous prime is 51216757. The next prime is 51216833. The reversal of 51216830 is 3861215.

51216830 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 51216830.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51216833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2120 + ... + 10340.

It is an arithmetic number, because the mean of its divisors is an integer number (3329910).

Almost surely, 2^51216830 is an apocalyptic number.

51216830 is an abundant number, since it is smaller than the sum of its proper divisors (55340290).

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

51216830 is a wasteful number, since it uses less digits than its factorization.

51216830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8324.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 51216830 is about 7156.5934633735. The cubic root of 51216830 is about 371.3677886589.

The spelling of 51216830 in words is "fifty-one million, two hundred sixteen thousand, eight hundred thirty".