1812615532728 has 256 divisors, whose sum is σ = 6404532019200. Its totient is φ = 411719708160.

The previous prime is 1812615532697. The next prime is 1812615532753. The reversal of 1812615532728 is 8272355162181.

It is a super-2 number, since 2×1812615532728² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1529076 + ... + 2441987.

It is an arithmetic number, because the mean of its divisors is an integer number (25017703200).

Almost surely, 2^{1812615532728} is an apocalyptic number.

It is an amenable number.

1812615532728 is an abundant number, since it is smaller than the sum of its proper divisors (4591916486472).

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

1812615532728 is a wasteful number, since it uses less digits than its factorization.

1812615532728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3971122 (or 3971118 counting only the distinct ones).

The product of its digits is 1612800, while the sum is 51.

The spelling of 1812615532728 in words is "one trillion, eight hundred twelve billion, six hundred fifteen million, five hundred thirty-two thousand, seven hundred twenty-eight".