27405980 has 48 divisors (see below), whose sum is σ = 69242880. Its totient is φ = 8900928.

The previous prime is 27405977. The next prime is 27405991. The reversal of 27405980 is 8950472.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 27405980.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2492 + ... + 7811.

It is an arithmetic number, because the mean of its divisors is an integer number (1442560).

Almost surely, 2^27405980 is an apocalyptic number.

27405980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27405980 is an abundant number, since it is smaller than the sum of its proper divisors (41836900).

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

27405980 is a wasteful number, since it uses less digits than its factorization.

27405980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10338 (or 10336 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 27405980 is about 5235.0721102961. The cubic root of 27405980 is about 301.4961556200.

The spelling of 27405980 in words is "twenty-seven million, four hundred five thousand, nine hundred eighty".