27815980 has 24 divisors (see below), whose sum is σ = 58601088. Its totient is φ = 11090688.

The previous prime is 27815941. The next prime is 27815987. The reversal of 27815980 is 8951872.

It is not an unprimeable number, because it can be changed into a prime (27815987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4677 + ... + 8803.

It is an arithmetic number, because the mean of its divisors is an integer number (2441712).

Almost surely, 2^27815980 is an apocalyptic number.

27815980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27815980 is an abundant number, since it is smaller than the sum of its proper divisors (30785108).

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

27815980 is a wasteful number, since it uses less digits than its factorization.

27815980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4473 (or 4471 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 27815980 is about 5274.0857027546. The cubic root of 27815980 is about 302.9922046305.

The spelling of 27815980 in words is "twenty-seven million, eight hundred fifteen thousand, nine hundred eighty".