1820454768 has 120 divisors (see below), whose sum is σ = 5636532096. Its totient is φ = 543849600.

The previous prime is 1820454719. The next prime is 1820454821. The reversal of 1820454768 is 8674540281.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 104371 + ... + 120557.

Almost surely, 2^1820454768 is an apocalyptic number.

1820454768 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1820454768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2818266048).

1820454768 is an abundant number, since it is smaller than the sum of its proper divisors (3816077328).

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

1820454768 is a wasteful number, since it uses less digits than its factorization.

1820454768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16283 (or 16274 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 45.

The square root of 1820454768 is about 42666.7876456618. The cubic root of 1820454768 is about 1221.0308334954.

The spelling of 1820454768 in words is "one billion, eight hundred twenty million, four hundred fifty-four thousand, seven hundred sixty-eight".