1812813680 has 40 divisors (see below), whose sum is σ = 4223167200. Its totient is φ = 723684608.

The previous prime is 1812813671. The next prime is 1812813689. The reversal of 1812813680 is 863182181.

It is an interprime number because it is at equal distance from previous prime (1812813671) and next prime (1812813689).

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1812813689) 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, 18461 + ... + 62979.

It is an arithmetic number, because the mean of its divisors is an integer number (105579180).

Almost surely, 2^1812813680 is an apocalyptic number.

1812813680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1812813680 is an abundant number, since it is smaller than the sum of its proper divisors (2410353520).

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

1812813680 is a wasteful number, since it uses less digits than its factorization.

1812813680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45041 (or 45035 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 38.

The square root of 1812813680 is about 42577.1497402069. The cubic root of 1812813680 is about 1219.3200726265.

The spelling of 1812813680 in words is "one billion, eight hundred twelve million, eight hundred thirteen thousand, six hundred eighty".