27821055387 has 16 divisors (see below), whose sum is σ = 39070080000. Its totient is φ = 17560849824.

The previous prime is 27821055347. The next prime is 27821055433. The reversal of 27821055387 is 78355012872.

It is not a de Polignac number, because 27821055387 - 2⁷ = 27821055259 is a prime.

It is a super-2 number, since 2×27821055387² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (27821055347) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45387 + ... + 240212.

It is an arithmetic number, because the mean of its divisors is an integer number (2441880000).

Almost surely, 2^27821055387 is an apocalyptic number.

27821055387 is a deficient number, since it is larger than the sum of its proper divisors (11249024613).

27821055387 is a wasteful number, since it uses less digits than its factorization.

27821055387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287330.

The product of its (nonzero) digits is 940800, while the sum is 48.

The spelling of 27821055387 in words is "twenty-seven billion, eight hundred twenty-one million, fifty-five thousand, three hundred eighty-seven".