1815844274028 has 36 divisors (see below), whose sum is σ = 4641624416520. Its totient is φ = 598480508736.

The previous prime is 1815844274017. The next prime is 1815844274029. The reversal of 1815844274028 is 8204724485181.

1815844274028 is a `hidden beast` number, since 1 + 8 + 158 + 4 + 427 + 40 + 28 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (1815844274029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 283368250 + ... + 283374657.

It is an arithmetic number, because the mean of its divisors is an integer number (128934011570).

Almost surely, 2^{1815844274028} is an apocalyptic number.

1815844274028 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1815844274028 is an abundant number, since it is smaller than the sum of its proper divisors (2825780142492).

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

1815844274028 is a wasteful number, since it uses less digits than its factorization.

1815844274028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 566743006 (or 566743001 counting only the distinct ones).

The product of its (nonzero) digits is 4587520, while the sum is 54.

The spelling of 1815844274028 in words is "one trillion, eight hundred fifteen billion, eight hundred forty-four million, two hundred seventy-four thousand, twenty-eight".