27979420 has 24 divisors (see below), whose sum is σ = 67150944. Its totient is φ = 9592896.

The previous prime is 27979417. The next prime is 27979421. The reversal of 27979420 is 2497972.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27979421) 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, 99787 + ... + 100066.

It is an arithmetic number, because the mean of its divisors is an integer number (2797956).

Almost surely, 2^27979420 is an apocalyptic number.

27979420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27979420 is an abundant number, since it is smaller than the sum of its proper divisors (39171524).

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

27979420 is a wasteful number, since it uses less digits than its factorization.

27979420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199869 (or 199867 counting only the distinct ones).

The product of its (nonzero) digits is 63504, while the sum is 40.

The square root of 27979420 is about 5289.5576374589. The cubic root of 27979420 is about 303.5844825232.

The spelling of 27979420 in words is "twenty-seven million, nine hundred seventy-nine thousand, four hundred twenty".