27391980 has 192 divisors, whose sum is σ = 98380800. Its totient is φ = 5691840.

The previous prime is 27391967. The next prime is 27391993. The reversal of 27391980 is 8919372.

It is an interprime number because it is at equal distance from previous prime (27391967) and next prime (27391993).

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a Saint-Exupery number, since it is equal to the product of the sides of a Pythagorean triangle: 385 × 231 × 308.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2490175 + ... + 2490185.

It is an arithmetic number, because the mean of its divisors is an integer number (512400).

Almost surely, 2^27391980 is an apocalyptic number.

27391980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27391980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49190400).

27391980 is an abundant number, since it is smaller than the sum of its proper divisors (70988820).

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

27391980 is a wasteful number, since it uses less digits than its factorization.

27391980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66 (or 28 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 39.

The square root of 27391980 is about 5233.7348041337. The cubic root of 27391980 is about 301.4448083700. Note that the first 3 decimals are identical.

The spelling of 27391980 in words is "twenty-seven million, three hundred ninety-one thousand, nine hundred eighty".