27489840 has 80 divisors (see below), whose sum is σ = 97398528. Its totient is φ = 6283008.

The previous prime is 27489823. The next prime is 27489841. The reversal of 27489840 is 4898472.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 27489792 and 27489801.

It is not an unprimeable number, because it can be changed into a prime (27489841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6502 + ... + 9861.

Almost surely, 2^27489840 is an apocalyptic number.

27489840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27489840 is an abundant number, since it is smaller than the sum of its proper divisors (69908688).

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

27489840 is a wasteful number, since it uses less digits than its factorization.

27489840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16386 (or 16380 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 27489840 is about 5243.0754333692. The cubic root of 27489840 is about 301.8033601417.

The spelling of 27489840 in words is "twenty-seven million, four hundred eighty-nine thousand, eight hundred forty".