51820518 has 16 divisors (see below), whose sum is σ = 108147456. Its totient is φ = 16522440.

The previous prime is 51820513. The next prime is 51820529. The reversal of 51820518 is 81502815.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51820513) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 187618 + ... + 187893.

It is an arithmetic number, because the mean of its divisors is an integer number (6759216).

Almost surely, 2^51820518 is an apocalyptic number.

51820518 is an abundant number, since it is smaller than the sum of its proper divisors (56326938).

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

51820518 is a wasteful number, since it uses less digits than its factorization.

51820518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375539.

The product of its (nonzero) digits is 3200, while the sum is 30.

The square root of 51820518 is about 7198.6469561995. The cubic root of 51820518 is about 372.8211856770.

The spelling of 51820518 in words is "fifty-one million, eight hundred twenty thousand, five hundred eighteen".