27878225 has 18 divisors (see below), whose sum is σ = 36495990. Its totient is φ = 21121920.

The previous prime is 27878219. The next prime is 27878239. The reversal of 27878225 is 52287872.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 6385729 + 21492496 = 2527^2 + 4636^2 .

It is not a de Polignac number, because 27878225 - 2⁴ = 27878209 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 7481 + ... + 10569.

It is an arithmetic number, because the mean of its divisors is an integer number (2027555).

Almost surely, 2^27878225 is an apocalyptic number.

27878225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

27878225 is a deficient number, since it is larger than the sum of its proper divisors (8617765).

27878225 is a wasteful number, since it uses less digits than its factorization.

27878225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3137 (or 3113 counting only the distinct ones).

The product of its digits is 125440, while the sum is 41.

The square root of 27878225 is about 5279.9834280043. The cubic root of 27878225 is about 303.2180424341.

The spelling of 27878225 in words is "twenty-seven million, eight hundred seventy-eight thousand, two hundred twenty-five".