1812564828 has 36 divisors (see below), whose sum is σ = 4617849600. Its totient is φ = 599429376.

The previous prime is 1812564697. The next prime is 1812564839. The reversal of 1812564828 is 8284652181.

1812564828 is a `hidden beast` number, since 1 + 8 + 1 + 2 + 564 + 82 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 193653 + ... + 202796.

It is an arithmetic number, because the mean of its divisors is an integer number (128273600).

Almost surely, 2^1812564828 is an apocalyptic number.

1812564828 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1812564828 is an abundant number, since it is smaller than the sum of its proper divisors (2805284772).

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

1812564828 is a wasteful number, since it uses less digits than its factorization.

1812564828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396586 (or 396581 counting only the distinct ones).

The product of its digits is 245760, while the sum is 45.

The square root of 1812564828 is about 42574.2272742560. The cubic root of 1812564828 is about 1219.2642764669.

The spelling of 1812564828 in words is "one billion, eight hundred twelve million, five hundred sixty-four thousand, eight hundred twenty-eight".