27780736 has 32 divisors (see below), whose sum is σ = 58262400. Its totient is φ = 13158144.

The previous prime is 27780733. The next prime is 27780751. The reversal of 27780736 is 63708772.

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (27780733) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3280 + ... + 8143.

It is an arithmetic number, because the mean of its divisors is an integer number (1820700).

Almost surely, 2^27780736 is an apocalyptic number.

It is an amenable number.

27780736 is an abundant number, since it is smaller than the sum of its proper divisors (30481664).

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

27780736 is a wasteful number, since it uses less digits than its factorization.

27780736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11456 (or 11444 counting only the distinct ones).

The product of its (nonzero) digits is 98784, while the sum is 40.

The square root of 27780736 is about 5270.7434010773. The cubic root of 27780736 is about 302.8641826501.

Subtracting 27780736 from its reverse (63708772), we obtain a square (35928036 = 5994²).

The spelling of 27780736 in words is "twenty-seven million, seven hundred eighty thousand, seven hundred thirty-six".