1812587868 has 180 divisors, whose sum is σ = 5865237840. Its totient is φ = 477944064.

The previous prime is 1812587867. The next prime is 1812587941. The reversal of 1812587868 is 8687852181.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1812587867) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 380928 + ... + 385656.

Almost surely, 2^1812587868 is an apocalyptic number.

1812587868 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 1812587868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2932618920).

1812587868 is an abundant number, since it is smaller than the sum of its proper divisors (4052649972).

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

1812587868 is a wasteful number, since it uses less digits than its factorization.

1812587868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4778 (or 4754 counting only the distinct ones).

The product of its digits is 1720320, while the sum is 54.

The square root of 1812587868 is about 42574.4978596342. The cubic root of 1812587868 is about 1219.2694425773.

The spelling of 1812587868 in words is "one billion, eight hundred twelve million, five hundred eighty-seven thousand, eight hundred sixty-eight".