1620316818 has 32 divisors (see below), whose sum is σ = 3812512320. Its totient is φ = 508334400.

The previous prime is 1620316769. The next prime is 1620316829. The reversal of 1620316818 is 8186130261.

1620316818 is a `hidden beast` number, since 1 + 620 + 3 + 16 + 8 + 18 = 666.

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, 881608 + ... + 883443.

It is an arithmetic number, because the mean of its divisors is an integer number (119141010).

Almost surely, 2^1620316818 is an apocalyptic number.

1620316818 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1620316818 is an abundant number, since it is smaller than the sum of its proper divisors (2192195502).

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

1620316818 is a wasteful number, since it uses less digits than its factorization.

1620316818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1765079 (or 1765073 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 1620316818 is about 40253.1591058391. The cubic root of 1620316818 is about 1174.5368491217.

The spelling of 1620316818 in words is "one billion, six hundred twenty million, three hundred sixteen thousand, eight hundred eighteen".