27878947 has 12 divisors (see below), whose sum is σ = 30449520. Its totient is φ = 25491312.

The previous prime is 27878941. The next prime is 27878989. The reversal of 27878947 is 74987872.

It is a happy number.

It is not a de Polignac number, because 27878947 - 2⁷ = 27878819 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 27878894 and 27878903.

It is not an unprimeable number, because it can be changed into a prime (27878941) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9138 + ... + 11800.

It is an arithmetic number, because the mean of its divisors is an integer number (2537460).

Almost surely, 2^27878947 is an apocalyptic number.

27878947 is a deficient number, since it is larger than the sum of its proper divisors (2570573).

27878947 is a wasteful number, since it uses less digits than its factorization.

27878947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2730 (or 2711 counting only the distinct ones).

The product of its digits is 1580544, while the sum is 52.

The square root of 27878947 is about 5280.0517989883. The cubic root of 27878947 is about 303.2206600271.

The spelling of 27878947 in words is "twenty-seven million, eight hundred seventy-eight thousand, nine hundred forty-seven".