1820196864 has 108 divisors (see below), whose sum is σ = 5261734296. Its totient is φ = 606339072.

The previous prime is 1820196857. The next prime is 1820196887. The reversal of 1820196864 is 4686910281.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1178877 + ... + 1180419.

It is an arithmetic number, because the mean of its divisors is an integer number (48719762).

Almost surely, 2^1820196864 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 1820196864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2630867148).

1820196864 is an abundant number, since it is smaller than the sum of its proper divisors (3441537432).

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

1820196864 is an frugal number, since it uses more digits than its factorization.

1820196864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1583 (or 1548 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The square root of 1820196864 is about 42663.7652346813. The cubic root of 1820196864 is about 1220.9731695875.

The spelling of 1820196864 in words is "one billion, eight hundred twenty million, one hundred ninety-six thousand, eight hundred sixty-four".