27983681540 has 24 divisors (see below), whose sum is σ = 58770761112. Its totient is φ = 11192514560.

The previous prime is 27983681477. The next prime is 27983681567. The reversal of 27983681540 is 4518638972.

It can be written as a sum of positive squares in 4 ways, for example, as 5428447684 + 22555233856 = 73678^2 + 150184^2 .

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, 209102 + ... + 315738.

It is an arithmetic number, because the mean of its divisors is an integer number (2448781713).

It is a 1-persistent number, because it is pandigital, but 2⋅27983681540 = 55967363080 is not.

Almost surely, 2^27983681540 is an apocalyptic number.

27983681540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27983681540 is an abundant number, since it is smaller than the sum of its proper divisors (30787079572).

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

27983681540 is a wasteful number, since it uses less digits than its factorization.

27983681540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119767 (or 119765 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 53.

The spelling of 27983681540 in words is "twenty-seven billion, nine hundred eighty-three million, six hundred eighty-one thousand, five hundred forty".