27878920 has 32 divisors (see below), whose sum is σ = 64753920. Its totient is φ = 10791360.

The previous prime is 27878911. The next prime is 27878923. The reversal of 27878920 is 2987872.

It is not an unprimeable number, because it can be changed into a prime (27878923) 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, 10002 + ... + 12481.

It is an arithmetic number, because the mean of its divisors is an integer number (2023560).

Almost surely, 2^27878920 is an apocalyptic number.

27878920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27878920 is an abundant number, since it is smaller than the sum of its proper divisors (36875000).

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

27878920 is a wasteful number, since it uses less digits than its factorization.

27878920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22525 (or 22521 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 43.

The square root of 27878920 is about 5280.0492421946. The cubic root of 27878920 is about 303.2205621401.

The spelling of 27878920 in words is "twenty-seven million, eight hundred seventy-eight thousand, nine hundred twenty".