1816868544 has 56 divisors (see below), whose sum is σ = 4868021760. Its totient is φ = 597951744.

The previous prime is 1816868533. The next prime is 1816868569. The reversal of 1816868544 is 4458686181.

It is a super-2 number, since 2×1816868544² = 6602022612353359872, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44724 + ... + 75059.

It is an arithmetic number, because the mean of its divisors is an integer number (86928960).

Almost surely, 2^1816868544 is an apocalyptic number.

It is an amenable number.

1816868544 is an abundant number, since it is smaller than the sum of its proper divisors (3051153216).

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

1816868544 is a wasteful number, since it uses less digits than its factorization.

1816868544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119877 (or 119867 counting only the distinct ones).

The product of its digits is 1474560, while the sum is 51.

The square root of 1816868544 is about 42624.7409845503. The cubic root of 1816868544 is about 1220.2285122437.

The spelling of 1816868544 in words is "one billion, eight hundred sixteen million, eight hundred sixty-eight thousand, five hundred forty-four".