27990920 has 32 divisors (see below), whose sum is σ = 63745920. Its totient is φ = 11060160.

The previous prime is 27990917. The next prime is 27990929. The reversal of 27990920 is 2909972.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (27990929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 896 + ... + 7535.

It is an arithmetic number, because the mean of its divisors is an integer number (1992060).

Almost surely, 2^27990920 is an apocalyptic number.

27990920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27990920 is an abundant number, since it is smaller than the sum of its proper divisors (35755000).

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

27990920 is a wasteful number, since it uses less digits than its factorization.

27990920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8525 (or 8521 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 38.

The square root of 27990920 is about 5290.6445732066. The cubic root of 27990920 is about 303.6260695580.

The spelling of 27990920 in words is "twenty-seven million, nine hundred ninety thousand, nine hundred twenty".