518151820 has 48 divisors (see below), whose sum is σ = 1138173120. Its totient is φ = 197770496.

The previous prime is 518151773. The next prime is 518151833. The reversal of 518151820 is 28151815.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 233034 + ... + 235246.

It is an arithmetic number, because the mean of its divisors is an integer number (23711940).

Almost surely, 2^518151820 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 518151820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (569086560).

518151820 is an abundant number, since it is smaller than the sum of its proper divisors (620021300).

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

518151820 is a wasteful number, since it uses less digits than its factorization.

518151820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2754 (or 2752 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 31.

The square root of 518151820 is about 22762.9484030518. The cubic root of 518151820 is about 803.1913252920.

It can be divided in two parts, 51815 and 1820, that added together give a palindrome (53635).

The spelling of 518151820 in words is "five hundred eighteen million, one hundred fifty-one thousand, eight hundred twenty".