27428787 has 20 divisors (see below), whose sum is σ = 41408136. Its totient is φ = 18092160.

The previous prime is 27428783. The next prime is 27428813. The reversal of 27428787 is 78782472.

It is not a de Polignac number, because 27428787 - 2² = 27428783 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (27428783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6112 + ... + 9602.

Almost surely, 2^27428787 is an apocalyptic number.

27428787 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

27428787 is the 2619-th decagonal number.

27428787 is a deficient number, since it is larger than the sum of its proper divisors (13979349).

27428787 is an equidigital number, since it uses as much as digits as its factorization.

27428787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3600 (or 3591 counting only the distinct ones).

The product of its digits is 351232, while the sum is 45.

The square root of 27428787 is about 5237.2499462982. The cubic root of 27428787 is about 301.5797665237.

The spelling of 27428787 in words is "twenty-seven million, four hundred twenty-eight thousand, seven hundred eighty-seven".