27978620 has 24 divisors (see below), whose sum is σ = 60782400. Its totient is φ = 10805312.

The previous prime is 27978619. The next prime is 27978661. The reversal of 27978620 is 2687972.

It is a congruent number.

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, 23540 + ... + 24699.

It is an arithmetic number, because the mean of its divisors is an integer number (2532600).

Almost surely, 2^27978620 is an apocalyptic number.

27978620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27978620 is an abundant number, since it is smaller than the sum of its proper divisors (32803780).

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

27978620 is a wasteful number, since it uses less digits than its factorization.

27978620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48277 (or 48275 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 27978620 is about 5289.4820162281. The cubic root of 27978620 is about 303.5815890882.

The spelling of 27978620 in words is "twenty-seven million, nine hundred seventy-eight thousand, six hundred twenty".