27920109906 has 48 divisors (see below), whose sum is σ = 67979411136. Its totient is φ = 8217288288.

The previous prime is 27920109887. The next prime is 27920109913. The reversal of 27920109906 is 60990102972.

It is a super-3 number, since 3×27920109906³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2588460 + ... + 2599223.

It is an arithmetic number, because the mean of its divisors is an integer number (1416237732).

Almost surely, 2^27920109906 is an apocalyptic number.

27920109906 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

27920109906 is an abundant number, since it is smaller than the sum of its proper divisors (40059301230).

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

27920109906 is a wasteful number, since it uses less digits than its factorization.

27920109906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5187727 (or 5187724 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The spelling of 27920109906 in words is "twenty-seven billion, nine hundred twenty million, one hundred nine thousand, nine hundred six".