27387990 has 128 divisors (see below), whose sum is σ = 85662720. Its totient is φ = 6096384.

The previous prime is 27387989. The next prime is 27387991. The reversal of 27387990 is 9978372.

It is an interprime number because it is at equal distance from previous prime (27387989) and next prime (27387991).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27387991) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 81102 + ... + 81438.

It is an arithmetic number, because the mean of its divisors is an integer number (669240).

Almost surely, 2^27387990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27387990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42831360).

27387990 is an abundant number, since it is smaller than the sum of its proper divisors (58274730).

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

27387990 is a wasteful number, since it uses less digits than its factorization.

27387990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403 (or 397 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 45.

The square root of 27387990 is about 5233.3536093025. The cubic root of 27387990 is about 301.4301712002.

The spelling of 27387990 in words is "twenty-seven million, three hundred eighty-seven thousand, nine hundred ninety".